Air Filters

Carbon Fibre Air Box Intake System - Non Varioram Cars

Bring more character from the air-cooled flat-six in your Porsche 993 with the Rennline Carbon Fibre Air Box Intake System.

Developed as a functional and visual upgrade for the original intake system, the Rennline air box is designed to improve airflow, enhance induction sound and replace ageing factory plastic components with premium motorsport-inspired carbon fibre.

Fits:

• Porsche 993 (911) C2 1994-95
• Porsche 993 (911) C4 1994-95
• Porsche 993 (911) C2S 1994-95
• Porsche 993 (911) C4S 1994-95

The Porsche 993 represents the final evolution of the air-cooled 911, and its flat-six engine is a major part of the driving experience. Rennline's intake system allows more of that character to be heard, delivering a more engaging induction note while giving the engine bay a cleaner, more purposeful appearance.

Carbon Fibre Intake Upgrade

The Rennline air box replaces the decades-old factory plastic intake components with lightweight carbon fibre construction. Its exposed carbon weave provides a premium finish that works particularly well in restored, modified and performance-focused Porsche 993 engine bays.

Unlike a purely cosmetic carbon fibre replacement, this system has been developed as a functional intake upgrade, with increased airflow and a more pronounced induction sound helping to make the naturally aspirated flat-six feel more engaging from behind the wheel.

What Does the Rennline Carbon Fibre Air Box Do?

The air box forms an important part of the engine's intake system, directing filtered air towards the engine while providing a controlled path for airflow.

Rennline's redesigned carbon fibre system is engineered to improve airflow compared with the ageing factory arrangement while allowing more of the characteristic flat-six induction sound to reach the driver.

The result is a modification that enhances the driving experience without compromising the classic character that makes the Porsche 993 so distinctive.

Why Upgrade the Original Porsche 993 Air Box?

Original Porsche 993 intake components are now decades old. Repeated heat cycles, vibration and general ageing can leave plastic components faded, brittle or cosmetically tired.

Replacing the original air box with the Rennline carbon fibre system provides an opportunity to refresh the intake while introducing several improvements:

• Increased intake airflow
• Enhanced flat-six induction sound
• Lightweight carbon fibre construction
• Reduced weight compared with ageing factory components
• Improved engine bay appearance
• Premium motorsport-inspired carbon weave
• More engaging throttle and induction character
• Purpose-designed for the Porsche 993

Enhanced Air-Cooled Flat-Six Sound

One of the principal attractions of this intake upgrade is sound.

The naturally aspirated air-cooled flat-six is central to the character of the Porsche 993, and the Rennline intake allows more of its induction note to be heard as engine speed and throttle opening increase.

This creates a stronger connection between throttle input and engine response, particularly during enthusiastic driving, without changing the fundamental character of the 993.

Premium Carbon Fibre Construction

Carbon fibre provides a natural choice for a performance-focused intake system, combining low weight with a distinctive motorsport appearance.

The exposed weave transforms an area normally dominated by black factory plastic and makes the air box a prominent feature within the 993 engine bay. It pairs particularly well with other carbon fibre engine components and performance upgrades.

Porsche 993 Carbon Fibre Intake Upgrades

Carbon fibre intake systems are a popular upgrade for owners looking to combine performance-focused engineering with improved engine bay presentation.

For the Porsche 993, where many original plastic components are now several decades old, a high-quality carbon fibre air box provides an effective way to modernise the intake while respecting the character of the final air-cooled 911 generation.

The Rennline system is particularly suited to owners searching for a Porsche 993 carbon fibre air box, 993 induction upgrade or lightweight intake system that provides both functional and visual improvements.

Benefits of Upgrading

Installing the Rennline Carbon Fibre Air Box can provide:

• Improved intake airflow
• More engaging induction sound
• Reduced intake component weight
• Replacement of ageing factory plastics
• Premium carbon fibre engine bay appearance
• Enhanced flat-six driving experience
• Motorsport-inspired styling
• A high-quality upgrade for restored or modified Porsche 993 models

Related reference numbers
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M181

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Air filter. Porsche 993 1994-97



Fits:
Porsche 993 1994-97

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99311032701

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Replacement panel air filter.



Fits:
Porsche 993 1994-97

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99311032701

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Replacement panel air filter.



Fits:
Porsche 993 1994-97

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99311032701

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Replacement panel air filter
Designed for installation within the factory airbox, this OE Match filter integrates seamlessly with the original intake system and maintains the correct balance between filtration efficiency and unrestricted airflow. It is ideal for routine maintenance, servicing, or restoration work on Porsche 993 models.

Fits:
Porsche 993 1994 - 1997

The air filter cleans incoming air before it reaches the engine combustion chambers. By preventing contaminants from entering the intake system, it helps protect internal engine components, maintain performance, and support efficient combustion.

Function
• Filters dust, dirt, and airborne contaminants from intake air
• Maintains clean airflow into the engine
• Helps preserve engine performance and efficiency
• Protects internal engine components from wear
• Supports smooth combustion and throttle response

Over time, air filters become clogged with dirt and debris, restricting airflow to the engine. A dirty filter can reduce performance, throttle response, and fuel efficiency while increasing engine wear. Replacing the filter at regular service intervals helps maintain optimal airflow, engine protection, and reliable operation.

When to replace
•  During routine scheduled servicing
•  Reduced engine performance or throttle response
•  Dirty or clogged filter element
•  Increased fuel consumption
•  After driving in dusty or harsh environments

Related reference numbers
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99311032701

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BMC Air Filter.



This Product Fits:
Porsche 993 Carrera / 993 Turbo

Panel Filter Size:
- width - 240mm
- height - 325mm


BMC air filters are designed and produced to ensure a higher air flow than original paper filters. In F1, for example, BMC cotton filters minimize the loss of air flow pressure passing through the air filter; this way ensures the best conditions for full exploitation of maximum power. Therefore the benefits of replacing the original paper filter with BMC cotton air filter, produced using the same technology and materials as the F1 air filters, are evident.

DESIGN AND MATERIALS
Qualified engineers using advanced software and expert technicians using the latest technologies produce BMC air filters. An F1 filter must be very light, must be made of the best raw materials and must improve performance. For this reason we use only alloy mesh with epoxy coating to ensure protection from petrol fumes and from oxidization due to the humidity of the air. The filtering material is composed of a special cotton gauze soaked with low-viscosity oil to give you the best air permeability.

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FB136

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K&N High Performance replacement air filter.



This Product Fits:
Porsche 993 3.6L 1993-97
Porsche 993 3.8L 1995-97


K&N® washable, reusable High-Flow Air Filters™ feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower.

Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty.

K&N drop-in replacement filters are designed to install easily into your factory air box.

Works with Original Equipment Manufacturer Vehicle Electronics.

Environmentally Friendly, K&N Reusable Air Filters

Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!

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33-2731

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Sport Airbox Cover. Porsche 993



Fits:
Porsche 993 C2 / C4 1994-98

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99311003056

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