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If you want the sound get a BMS intake I have one and removed the cowl and slapped on Cowl Filters from BMS. Nice loud Swoosh when you let off the throttle. You can not use a BOV on a n55, the DV Valve is on the Turbo housing deep inside the engine.
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BMW Performance Kidney Grille, CF Lip Spoiler, CF Diffusser, Blackline LCI Tailights, Magnaflow Full Exhaust, BMS Intake, Jb4 w/ E85, Meth Injection, BMS DP, VRSF 5" Intercooler, CP-E Charge Pipe, KW CS Coilover, M3 Subframe Bushings, VMR VB3 Wheels, Stage 2 Fuel Pump, M3 Control Arms, Dinan Camber Plates, Pure Stage 2.
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