Sports Catalytic Converters. Porsche 997.1 Carrera 2 / 2S / 4 / 4S  ❭  9M99711303402

Ninemeister sports catalytic converters for Porsche 997.1. Manufactured from lightweight SS304L stainless steel, these replacement catalysts use Belgium-made TriCore 300-cell cores to increase exhaust flow while retaining catalytic gas treatment.

Fits:

• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08

What This Product Does

These sports catalysts replace the original catalytic converter sections within the exhaust system. Their higher-flow construction reduces back pressure and allows exhaust gases to pass more freely, while the catalytic cores continue to convert carbon monoxide, hydrocarbons and nitrogen oxides. The resulting installation is designed to provide a more pronounced exhaust note and save 2.5 kg compared with the original arrangement.

Functions

• Replaces the original Porsche 997.1 catalytic converter sections
• Uses 300-cell catalyst cores to support increased exhaust flow
• Reduces exhaust back pressure
• Treats carbon monoxide, hydrocarbons and nitrogen oxides
• Produces a more sporting exhaust note
• Provides a stated weight saving of 2.5 kg

Technical Details

• Lightweight SS304L stainless-steel construction
• Belgium-made TriCore 300-cell catalytic converters
• Two-part catalyst construction within each downpipe
• Three-spiral metallic carrier structure designed to resist pressure waves and exhaust pulses
• Effective operating temperature: 480–1470°F; short-term tolerance: 1650–1830°F; long-term tolerance: no more than 1560°F
• Manufacturer-described as MOT compliant and designed to operate without a catalyst-related check-engine light

The purification coating uses platinum, palladium and rhodium. Platinum supports the oxidation of carbon monoxide and hydrocarbons, palladium assists with unburnt hydrocarbon conversion, and rhodium provides nitrogen-oxide reduction. The manufacturer specifies Euro 6 standard purification coatings with a high density of precious metals.

Symptoms of Fault

• Catalyst-efficiency warning or check-engine light
• Rattling caused by a damaged internal substrate
• Restricted exhaust flow or reduced engine response
• Unusual exhaust smells or excessive heat
• Exhaust leakage around the catalyst flanges or joints
• Failure to meet the required emissions limits during testing

Why Replacement Matters

A deteriorated or obstructed catalyst can restrict exhaust flow, create rattling noises and cause emissions-related faults. These Ninemeister replacements combine higher-flow 300-cell cores with stainless-steel downpipes, making them suitable when renewing worn original units or changing the exhaust for reduced back pressure and a stronger exhaust note. Persistent misfires, oil consumption or over-fuelling should be corrected before installation, as prolonged exposure to excessive exhaust temperatures can shorten catalyst life.

FAQs

• What cell density do these catalysts use? They contain TriCore 300-cell catalytic converter cores.
• What are the downpipes made from? The construction uses lightweight SS304L stainless steel.
• Will they cause a check-engine light? Ninemeister describes the product as producing no catalyst-related CEL, provided the vehicle and its emissions-control components are operating correctly.
• Are they MOT compliant? The manufacturer lists the catalysts as MOT compliant, although the result of an emissions test also depends on the condition and calibration of the vehicle.