PureTurbos BMW N55 PURE500 N55 Install Kit:No Install Kit The S63 sounds decent from

The S63 sounds decent from factory but at Valvetronic Designs

Intelligent ECU exhaust control valve

Dyno tuned for maximum exhaust flow with minimum back pressure

4 Series F36 Gran Coupe 430i Gran Coupe (B46)

Part No: CF8468IMP

PureTurbos BMW N55 PURE500 N55 Install Kit:No Install Kit The S63 sounds decent fromStg1: Top end gains of up to 70whp depending on supporting mods Stg1 and Stg2 available for ALL N55 CARS. See Stg2 here. Features and Benefits of the PURE Stage 1 Turbo: Stealth stock appearance Stock like fast spool Easy to install (does not require turbofold removal) CNC Machined Compressor Housing VSR Balanced to OE N55 Specs Larger than Stock and our Original Stage 1 Billet Compressor Wheel New High Flow 9 Blade Drop In Turbine Wheel