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Porsche > Boxster 986/987/981 (1997-2016) > Suspension Upgrades >

Anti Roll Sway Bar

Anti Roll Sway Bar

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DISPLAYING 17 to 25 (of 25 products)
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Lateral support clamp anti roll bar. Various sizes for Porsche - PFC13-14, PFC15-16, PFC17-18, PFC19-20, PFC21-22, PFC23-24, PFC25-27, PFC31-33, PFC28-30
3
Lateral support clamp anti roll bar. Various sizes for Porsche
PFC
Product Information
Product Information
Lateral support clamp anti roll bar. 



Anti-Roll Bars (ARB’s) play an important role in a vehicle’s suspension system, helping to reduce body roll by transferring cornering load from one side of a vehicle to the other.

Often mounted to the vehicle’s chassis with rubber bushes, these bushes ensure the bar works as intended. To prevent the anti-roll bar from moving laterally within its mounts when turning, OE manufacturers will either bond the bushes to the bar, add dead-stops to the bar itself, or rely solely on the clamping pressure of the rubber.

But what happens when those bushes wear and need to be replaced? Often anti-roll bars with bonded bushes come as a costly complete assembly, so the alternative is to fit a more cost-effective unbonded polyurethane replacement, like the many we offer.

In most cases, friction from the bush will prevent any side-to-side bar movement. Still, when turning aggressively or cornering at higher speeds, a laterally shifting anti-roll bar decreases the efficiency and effectiveness of the bar, changing the dynamics of your suspension system in unpredictable ways. It also poses the risk of the bar fouling on other areas of the vehicle or suspension system.


Middle Lower Bar. Porsche 986 Boxster - Ultra Racing - ML2-1104, UR-ML2-1104
3
Middle Lower Bar. Porsche 986 Boxster - Ultra Racing
ML2-1104
Product Information
Product Information
Ultra Racing Middle Lower Bar / Middle Member Brace
Specification: 2 Points

Fits:
Porsche 986 Boxster 2.5L 1996>>

Please note: This product is a special order part and once ordered it cannot be cancelled or returned without our permission.
Rear Anti-Roll Bar. Porsche 981 Boxster / 982 Boxster / 982C Cayman 2012>> - 98133370314
5
Rear Anti-Roll Bar. Porsche 981 Boxster / 982 Boxster / 982C Cayman 2012>>
Special Order item
98133370314
Product Information
Product Information

Rear anti-roll bar 98133370314 by Porsche for selected 981 Boxster, 982 Boxster and 982C Cayman applications from 2012 onwards. This genuine rear stabiliser must be selected using the applicable vehicle PR codes.

Fits

  • Porsche 981 Boxster 2.7L / Boxster S and GTS 3.4L 2012–16 — PR:009,X73 or PR:008,X73 as specified by the parts diagram
  • Porsche 718 Boxster (982) 2017>> — 2.0L 300 Bhp base and T, 2.5L 350 Bhp S, 2.5L 365 Bhp GTS, 4.0L 400 Bhp GTS and Boxster 25 Years, including listed manual and PDK variants — PR:219,475477
  • Porsche 718 Cayman (982C) 2017>> — 2.0L 300 Bhp base and T, 2.5L 350 Bhp S, 2.5L 365 Bhp GTS and 4.0L 400 Bhp GTS, including listed manual and PDK variants — PR:006,030; PR:029; or PR:219,475477

Check fitment for your specific vehicle (model, year, engine) before ordering. Confirm the part number and PR codes against the VIN because visually similar stabilisers can have different specifications.

Diagram: Anti-roll bar 981 Boxster / Boxster S 2012-16

Diagram: Anti-roll bar 718 (982) Boxster 2017>>

Diagram: Anti-roll bar 718C (982C) Cayman 2017>>

What This Product Does

The anti-roll bar connects the left and right sides of the rear suspension. By resisting differences in suspension movement across the axle, it helps manage body roll and preserves the chassis balance specified for the vehicle.

Functions

  • Resists excessive lateral body movement during cornering
  • Connects suspension movement across the rear axle
  • Helps maintain the intended front-to-rear handling balance
  • Transfers loads through the stabiliser mountings and coupling rods

Technical Details

  • Part number: 98133370314
  • Catalogue description: anti-roll bar; stabiliser; stabilizer
  • Position: rear axle
  • Brand: genuine Porsche
  • Diagram quantity: 1
  • Application identifiers: PR:009,X73; PR:008,X73; PR:219,475477; PR:006,030; PR:029

Symptoms of Fault

  • Greater body roll or inconsistent behaviour through corners
  • Visible corrosion, bending or other physical damage
  • Excess movement around the mounting locations
  • Clunks or knocks when travelling over uneven surfaces
  • Unsettled response during quick changes of direction

Suspension noise does not necessarily indicate a defective bar. Worn bushes, coupling rods, brackets or fasteners are more frequent causes, so the complete stabiliser assembly should be inspected before parts are replaced.

Why Replacement Matters

A bent, damaged or incorrectly specified stabiliser can change the suspension characteristics intended for the car. Installing the correct PR-code-specific Porsche part helps retain the original rear chassis configuration. Inspect the associated bushes, clamps, brackets, links and fixings while access is available.

FAQs

  • How is the correct anti-roll bar identified?
    Compare part number 98133370314 and the listed PR codes with the vehicle VIN and factory equipment data.
  • Is the anti-roll bar always responsible for rear suspension knocks?
    No. Check the bushes, coupling rods, brackets and mounting hardware first, as wear in these components commonly causes noise.
  • Are bushes, brackets and coupling rods included?
    These are separate parts within the stabiliser assembly and should be assessed individually.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

98133370314
98133370314

The product you are viewing cross references to these numbers
Rear Lower Bar. Porsche 986 Boxster - Ultra Racing - RL4-1105, UR-RL4-1105
1
Rear Lower Bar. Porsche 986 Boxster - Ultra Racing
RL4-1105
Product Information
Product Information
Ultra Racing Rear Lower Bar / Rear Member Brace
Specification: 4 Points

Fits:
Porsche 986 Boxster 2.5L 1996>>


Please note: This product is a special order part and once ordered it cannot be cancelled or returned without our permission.

Rear lower strut brace. Porsche 981 / 718 Boxster / Cayman - RL4-2788
1
Rear lower strut brace. Porsche 981 / 718 Boxster / Cayman
RL4-2788
Product Information
Product Information

Ultra Racing 4 Point Rear Lower Brace.

The Ultra Racing rear lower brace is designed to increase rigidity across the rear section of the Porsche 981 chassis by connecting key mounting points around the rear suspension and subframe area.

Fits:

  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman 718 2.0L Manual (300 Bhp)
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L Manual (350 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L Manual (300 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)

Mounting points: 4
Position: Rear lower chassis / rear subframe area

During hard cornering, braking and acceleration, loads transferred through the suspension can cause a degree of movement or flex within the vehicle structure. The brace provides additional reinforcement between these mounting points, helping the rear suspension geometry remain more consistent under load.

The result is a more stable and predictable rear end, particularly during fast road driving, track days and other situations where the chassis is subjected to higher cornering loads.

What does the Ultra Racing rear lower brace do?

The suspension works most effectively when its mounting points remain stable.

As cornering forces increase, the chassis and subframe can experience small amounts of movement. Although this movement may be relatively minor, it can affect how accurately the suspension maintains its intended geometry.

The Ultra Racing rear lower brace links several important mounting points together, helping distribute loads across a wider section of the chassis.

This can help provide:

• Increased rear chassis rigidity
• Reduced movement around suspension mounting points
• More consistent rear suspension geometry
• Improved stability during hard cornering
• Sharper and more predictable handling response
• Improved driver feedback during enthusiastic driving

Why upgrade the Porsche 981 rear chassis?

The Porsche 981 Boxster and Cayman already have a highly capable chassis, but higher cornering loads can expose movement within suspension and subframe mounting areas.

This is particularly relevant where the vehicle has been fitted with:

• Performance tyres
• Wider wheels and tyres
• Sports suspension
• Lowering springs
• Coilover suspension
• Uprated anti-roll bars
• Track-focused suspension settings

These upgrades can increase the loads transmitted through the chassis.

Adding additional chassis reinforcement helps provide a more stable platform for the suspension to work from rather than allowing some of those forces to be absorbed through chassis movement.

How can the brace improve handling?

A suspension system is designed around specific geometry.

If the suspension mounting points move slightly under heavy loads, wheel alignment angles can also change dynamically. Additional chassis reinforcement helps reduce this movement.

Drivers may notice:

• More precise rear suspension response
• Improved stability during direction changes
• Greater confidence during high-speed cornering
• More predictable behaviour close to the car's handling limits
• Improved consistency during track driving
• Better feedback through the chassis

The difference is typically most noticeable during enthusiastic driving where higher cornering and braking forces are generated.

4-point chassis reinforcement

This brace uses a 4-point mounting arrangement.

Connecting four chassis or subframe mounting locations allows forces to be distributed across a larger structural area rather than concentrating loads at individual points.

This arrangement provides additional reinforcement across the rear underside of the vehicle while retaining a relatively simple bolt-on design.

Ultra Racing construction

Ultra Racing manufactures its chassis braces using steel tubing and reinforced mounting plates designed to provide high rigidity.

Ultra Racing states that its mounting brackets typically use approximately 4–5mm steel plate, while its hollow steel tubing is generally around 1.2–1.6mm thick depending on the application. The aim is to provide a rigid structure capable of maintaining its geometry under chassis load.

Please note: This product is a special order part and once ordered it cannot be cancelled or returned without our permission.

Stabilizer bar bush Front. Porsche 986/987 Boxster / 996 / 997 - 99634379217
2
Stabilizer bar bush Front. Porsche 986/987 Boxster / 996 / 997
PFF57-501-25
Product Information
Product Information
Stabilizer Bar Bush Front.



OEM Part Number: 997 343 701 08 PASM Bar

OEM Part Number: 996 343 792 17 Bush

Size: 25mm

Fits:
Porsche 986 Boxster S 3.2L 2000>> Cars with Sport-type chassis
Porsche 987.1 Boxster 2005-08 Cars with standard chassis and Manual Transmission
Porsche 987.1 Boxster / S 2005-08 Cars with PASM (electronic damper control)
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 TARGA 2002>> Cars with Sport-type Chassis (M030) and Tiptronic Transmission (M249)
Porsche 997.1 C2 CABRIO / COUPE 2005-08 Cars with Standard Chassis (I029) and 6-speed manual transmission (I480)
Porsche 997.1 C2S COUPE 2005-08 Cars with Sport-type Chassis (I030)
Porsche 997.1 C2/C2S COUPE / CABRIO 2005-08 Cars with PASM (electronic damper control) (I475)
Porsche 997.2 C2 COUPE / CABRIO 2009-12 Cars with Standard Chassis (I029) and PDK Transmission (I250)
Porsche 997.2 C2/C2S COUPE 2009-12 Cars with Sport-Type Chassis (I030)
Porsche 997.2 C2/C2S COUPE/CABRIO 2009-12 Cars with PASM (electronic damper control) (I475)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PFF57-501-25
99634379217

The product you are viewing cross references to these numbers
Stabilizer bar bush Front. Porsche 986/987 Boxster / 996 / 997 - 99634379217
2
Stabilizer bar bush Front. Porsche 986/987 Boxster / 996 / 997
PFF57-501-25BLK
Product Information
Product Information
Powerflex Black Series Stabilizer Bar Bush Front.



OEM Part Number: 997 343 701 08 PASM Bar

OEM Part Number: 996 343 792 17 Bush

Size: 25mm

Fits:
Porsche 986 Boxster S 3.2L 2000>> Cars with Sport-type chassis
Porsche 987.1 Boxster 2005-08 Cars with standard chassis and Manual Transmission
Porsche 987.1 Boxster / S 2005-08 Cars with PASM (electronic damper control)
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 TARGA 2002>> Cars with Sport-type Chassis (M030) and Tiptronic Transmission (M249)
Porsche 997.1 C2 CABRIO / COUPE 2005-08 Cars with Standard Chassis (I029) and 6-speed manual transmission (I480)
Porsche 997.1 C2S COUPE 2005-08 Cars with Sport-type Chassis (I030)
Porsche 997.1 C2/C2S COUPE / CABRIO 2005-08 Cars with PASM (electronic damper control) (I475)
Porsche 997.2 C2 COUPE / CABRIO 2009-12 Cars with Standard Chassis (I029) and PDK Transmission (I250)
Porsche 997.2 C2/C2S COUPE 2009-12 Cars with Sport-Type Chassis (I030)
Porsche 997.2 C2/C2S COUPE/CABRIO 2009-12 Cars with PASM (electronic damper control) (I475)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Powerflex Black Series - Designed for the Track - Ready to Race - Engineered to be the best.

Powerflex Black Series bushes are manufactured using a 95 Shore A compound to provide maximum control of chassis geometry. This compound can be up to 80% more resistant to load than standard rubber and 25% stiffer than our purple performance material.

If your requirements are purely for the ultimate in handling and chassis performance then Powerflex Black Series are unique, offering the most precise and accurate alignment for your chassis.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PFF57-501-25BLK
99634379217

The product you are viewing cross references to these numbers
Stabilizer Bar Bush FRONT. Porsche 996 / 997 / 986 Boxster SuperPro - SPF3721-24.5K, SPF3721-25.5K, SPF3721-25K, SPF3721-25K, SPF3721-27K, SPF3722-27.5K
2
Stabilizer Bar Bush FRONT. Porsche 996 / 997 / 986 Boxster SuperPro
SPF3721-
Product Information
Product Information
SuperPro Stabilizer Bar Bush. FRONT
Set of 2.



Fits:
Porsche 996 1997-2005
Porsche 997 2004>>
Porsche 986 Boxster 1997-04

Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:

- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components

Diagram Ref No 2. fits inside Ref No. 3
Stabilizer Bar Bush REAR. Porsche 996 / 997 / 986 Boxster SuperPro - 99633379224, 99633379226 - SPF3722-19.5K, SPF3722-19K, SPF3722-21.5K, SPF3722-21K, SPF3722-22K, SPF3722-24.5K, SPF3722-24K
3
Stabilizer Bar Bush REAR. Porsche 996 / 997 / 986 Boxster SuperPro
SPF3722-
Product Information
Product Information
SuperPro Stabilizer Bar Bush. REAR.
Set of 2.



Fits:
Porsche 996 1997-2005
Porsche 997 2004>>
Porsche 986 Boxster 1997-04

Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:

- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components

Diagram Ref No 2. fits inside Ref No. 3

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

SPF3722-
99633379224
99633379226

The product you are viewing cross references to these numbers
DISPLAYING 17 to 25 (of 25 products)
1 2
Also found on these pages
About Anti Roll Sway Bar

Anti Roll Bars / Sway Bars – Improved Handling and Body Control

Anti roll bars, also known as sway bars, are suspension upgrade components designed to reduce body roll during cornering and improve overall vehicle stability. By linking the left and right sides of the suspension, anti roll bars resist excessive chassis movement, helping the car stay flatter through corners and delivering sharper, more predictable handling.

At Design911, our range of anti roll bars includes high-quality OE replacement and performance upgrade options from trusted suspension brands. Whether you’re refreshing worn factory components or upgrading for fast-road and track use, anti roll bars are one of the most effective ways to enhance handling without compromising ride comfort.

What Do Anti Roll Bars / Sway Bars Do?

Anti roll bars are torsion bars mounted across the suspension axle that control lateral body movement when cornering. Their main functions include:

  • Reducing body roll during turns
  • Improving cornering balance and grip
  • Enhancing steering response and driver confidence
  • Distributing load more evenly across the suspension

By limiting excessive chassis lean, sway bars allow tyres to maintain better contact with the road, improving traction and control.

Why Upgrade Your Anti Roll Bars?

Upgrading anti roll bars is a popular suspension modification because it offers:

  • Noticeable handling improvements with minimal impact on ride comfort
  • Better control during spirited driving or track use
  • Improved balance between front and rear suspension
  • Reduced understeer or oversteer when correctly matched

Performance anti roll bars are often adjustable, allowing fine-tuning of suspension balance to suit driving style, tyre choice and road conditions.

When Should You Replace or Upgrade Anti Roll Bars?

Anti roll bars should be replaced or upgraded when:

  • Factory suspension feels soft or unstable during cornering
  • Rubber bushes or mounting hardware are worn or damaged
  • Upgrading other suspension components such as springs or dampers
  • Preparing a vehicle for fast-road, track day or performance use

Replacing tired components or upgrading to performance sway bars restores precise handling and improves overall driving enjoyment.

At Design911, we supply anti roll bars and suspension upgrades that meet professional workshop standards and enthusiast expectations.

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