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At TRS Performance
By removing the original restrictive catalytic converter located within the factory OEM downpipe
Once that’s completed successfully
be sure to read our B58 tuning guide found on the blog section
this is the ideal way to go
BC RACING COILOVERS ER SERIES - BMW 3 SERIES E46 98-06 (EXCL M3) (TRUE REAR COILOVER) Spring Rates:RECOMMENDED KIT 6/5 KG.MM At TRS PerformanceThe BC Racing ER Series is a high performance coilover system featuring external reservoirs and completely separate compression and rebound damping adjustment. It builds on the proven quality of the BR and DS Series but adds far greater tuning control, making the ER Series ideal for drivers who want more precise handling balance on fast road cars and track focused builds. Key Features Digressive piston and damping curve External reservoirs with 30