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Dyno tuned for maximum exhaust flow with minimum back pressure
The S63 sounds decent from factory but at Valvetronic Designs
Upgrade to the MAD BMW S55 downpipes to eliminate the backpressure caused by your stock catalytic converters
they will not only look the part
High-Performance Heat Exchanger (CSF#8154) Features:
PureTurbos BMW N55 PURE500 N55 Install Kit:No Install Kit Dyno tuned for maximum exhaustStg1: 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
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