Downpipe Exhaust For BMW 3 series M3, 4 series M4 - S55 Engines | SPELAB
---tab Description--- This Catless S55 downpipe replaces the restrictive factory downpipes and removes the catalytic converter for maximum flow. Engineered for BMW, it’s a direct bolt-on upgrade that…
TL;DR: ---tab Description--- This Catless S55 downpipe replaces the restrictive factory downpipes and removes the catalytic converter for maximum flow. Engineered for BMW, it’s a direct bolt-on upgrade that delivers stronger mid-range torque, faster turbo spool, and a more aggressive exhaust note. Who This…
