425 (driver side)996

delivering enhanced speed and bandwidth compared to the G4+ Atom II

CAT Cams helps your S54 engine perform at its peak

4L S63 V8 engine

This is especially crucial for high-performance

Race-Spec P54 Headers for E46 M3 by 5150 AutoSport 23-65000H 425 (driver side)996The 5150 AutoSport Race Spec P54 Header for E46 M3 is engineered for serious motorsport performance, drawing direct inspiration from BMWs legendary P54 race engine. Designed to maximize exhaust flow and reduce backpressure, this header is built to support high revving S54 engines under extreme racing conditions. Crafted from high grade stainless steel, it delivers exceptional durability and thermal stability while maintaining precise fitment for the