Garage Whifbitz Valved Cat Back Exhaust with 3.5 inch Single Mid Pipe/Centre Section for BMW M3/M4 F80 F

Garage Whifbitz stainless rear system for BMW M3 and M4 F8X

Give your F8X a proper voice and a real performance lift with this Garage Whifbitz valve‑controlled rear exhaust. Built for the twin‑turbo S55, it delivers a deeper, smoother soundtrack with reduced rasp and an impressive real‑world power increase. We have supplied and fitted this setup on customer cars and it continues to impress for tone, drivability and quality, with carbon fibre quad tailpipes that look as good as they sound.

Why enthusiasts choose this system

• Proven gain of around 12 bhp at the wheels on a standard S55
• Twin 3 inch front sections merge into a single 3.5 inch centre for superb flow
• Valve‑controlled rear section keeps factory valve operation and character
• Drive mode integration: calm in Efficient, assertive in Sport and Sport Plus
• Single 3.5 inch centre pipe helps tame the typical S55 rasp for a richer tone
• Oval centre section improves ground clearance for lowered and track‑focused setups
• Includes four carbon fibre tailpipes for a premium finish
• Durable stainless steel construction
• Titanium option available for those chasing ultimate weight saving

Design that works

This system starts as dual 3 inch pipes from the front, transitions into a single ovalised 3.5 inch centre section for maximum underbody clearance, then splits to feed a large rear silencer with two OE‑style valves. That architecture increases flow, sharpens throttle response and delivers a bass‑rich note without the harshness many S55 owners want to avoid. Cruise quietly day to day, then unleash a more aggressive sound when you select the sportier driving modes.

What is included

• Garage Whifbitz stainless centre and rear sections with valve control
• 4 x carbon fibre exhaust tips

Options

• Titanium version available for a super lightweight setup
• Front pipes and mid sections available separately if retaining the factory backbox

Compatibility

• BMW M3 F80 Saloon
• BMW M4 F82 Coupe
• BMW M4 F83 Convertible
• All F8X models with the S55 engine

Why buy from MJ Modifications

We run this hardware on customer builds and the feedback is consistently positive. Owners love the deeper tone, the quality of the welds and materials, and the seamless valve integration that keeps things refined when you want quiet and head‑turning when you want drama. If you are searching for a balanced upgrade that blends power, sound and everyday usability, this is a standout choice.

Professional fitting

Need installation We offer fitting at MJ Modifications in Warwickshire. For a tailored quote, email info@mjmodifications.co.uk.

Search terms customers use

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