BMW M3 F80 S55 3in (76mm) Catless Downpipes - Primary DeCat/De-Cat Cat Delete Pipes, Turbo Downpipe Upgrade, Pre-OPF/PPF Direct Fit, Track/Off-Road Only Performance Exhaust

S55 cat delete pipes for the F80 platform

Unlock sharper response, quicker turbo spool and a deeper soundtrack from your twin turbo straight six with these 3 inch 76.2 mm catless turbo pipes. Designed to mate to the factory system on pre-PPF cars, this primary catalyst bypass transforms the character of the F80 saloon for track and off road use.

• Cat delete for the S55 engine - removes the restrictive primary converters for improved flow
• 3 inch 76.2 mm bore for maximum gas velocity and reduced back pressure
• Noticeably faster turbo spool and crisper throttle response
• Deeper, more aggressive tone under load while retaining daily manners with the right tune and setup
• Direct-fit to the standard system on pre-PPF models

We have installed this upgrade on customer cars and the feedback has been outstanding - stronger mid-range punch, quicker pick-up and an addictive turbo whistle. Pair it with a high quality ECU calibration to unlock serious performance potential from your S55-powered F80.

Fitment and requirements

• Fits the OE system on pre-PPF cars only
• Replaces the primary catalysts - cat bypass configuration
• Requires 2 x BMW gasket, part number 18307851168, not included
• All other relevant gaskets and fittings are supplied

Tuning notes

Removing the OE primary converters can trigger an engine management light. An ECU remap is recommended to resolve EML warnings and to stabilise the power gains.

Legal and usage notice

Sold strictly for motorsport and off road use only worldwide.

Professional installation

Want it fitted right first time? Book your installation with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Why buy from MJ Modifications

• Proven upgrade on the F80 platform with excellent customer feedback
• Optimised 3 inch flow for the S55 twin turbo inline-six
• Ideal foundation for Stage 2 tuning and track-focused builds

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