Catless Downpipes 2015–2020 BMW M2 Competition/M3/M4 – S55

A pair of direct bolt-on catless downpipes for the BMW S55 twin-turbo inline-six, built from 304 stainless steel and TIG-welded. Removing the restrictive factory catalytic converters frees up exhaust flow on both turbos, sharpens throttle response, and lets the S55 deliver its full potential on a Stage 2+ tune.

Specifications

• 304 stainless steel construction, TIG-welded
• Long-pipe and short-pipe options, both 3.0 inch turbo side / 2.5 inch exhaust side
• Integrated thermal heat shield
• Direct bolt-on, no cutting or modification

What it does

• Frees up exhaust flow by removing both factory cats, cutting backpressure so the twin turbos spool faster and hold boost more easily.
• Built for Stage 2+, supporting higher boost and aggressive tunes for horsepower and torque gains across the rev range.
• Manages heat with the integrated shield, keeping exhaust heat inside the pipes to protect nearby wiring, sensors and intake parts and help hold lower EGTs under load.
• Sharpens the sound into a deeper, more aggressive M tone with added crackles and pops, without constant cabin drone.

Build quality

Each downpipe is TIG-welded for clean seams, smooth internal flow and reliable strength under repeated track abuse. Bolts directly to the factory location and works with both the stock and aftermarket exhaust systems. Backed by a lifetime warranty.

Compatible Models

M3: F80 Sedan (2015–2018)
M4: F82 Coupe (2015–2020) · F83 Convertible (2015–2020)
M2 Competition: F87 (2018–2021)