Milltek Sport Catted Turbo Downpipes / Hi-Flow Sports Cats for BMW M4 F82 F83 (S55, Coupe & Convertible, incl Competition) | T304 Stainless Front/Turbo Outlet Pipes | Fits Milltek Cat-Back Only | O2/Lambda Extensions Required | 2x 18307851168

Milltek Catted Turbo Downpipes for BMW M4 F82 F83 S55

Transform the way your M car breathes and sounds with Milltek’s catted turbo outlets featuring high flow catalytic converters. Built for the S55-powered BMW M4 F82 coupe and F83 cabriolet including Competition Package, this front section is about faster spool, cleaner flow and a deeper, motorsport-inspired tone without the dreaded drone. If you are chasing a serious exhaust upgrade that pairs premium build with daily drivability, this is it.

Built to perform, built to last

• AISI T304-grade stainless construction for outstanding corrosion resistance and long-term reliability
• Mandrel-bent, large diameter pipework for smooth gas velocity and improved turbo efficiency
• Precision TIG welds and quality hardware for a tight, leak-free fit
• Developed and manufactured in the UK by Milltek with a refined, sporty soundtrack

Why enthusiasts choose this upgrade

• Quicker turbo response and stronger mid-range punch on the S55 twin-turbo engine
• Catted design with high flow performance catalysts for freer breathing
• Enhanced exhaust character that stays civilised on the motorway and around town
• Ideal foundation for future tuning, remaps and supporting mods

Vehicle compatibility

BMW M4 S55 platform:

• F82 coupe
• F83 convertible
• Including Competition models

Important fitment notes

• To be used with a Milltek cat back system
• O2 sensor extension leads are required
• Additional BMW parts needed: 2 x 18307851168

Real-world results

We have installed this setup at MJ Modifications and the feedback speaks for itself. Customers report crisper throttle response, a more urgent pull through the revs and a purposeful, clean soundtrack with no intrusive cabin resonance. The craftsmanship and fit quality are consistently praised.

Professional installation

We recommend expert fitting. Book your installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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Compliance and advice

Please check local regulations regarding emissions and use of performance catalytic converters. If you are unsure about compatibility with your current system or tuning goals, contact us for guidance.

Additional BMW parts required for installation: 2 x 18307851168