Just add the Ar design DP on my 135i with N54. The car are crazy in speed.
But, when I push up the rev. , it got some "zu,zu......." sound from the middle of the car ( around the DP area.) in between 1700-2000rev. After 2000rev, sound is gone.
Is it alright? Did someone get this sound after the DP changed too?
2011 Z4 35is Alpine White DCT Alcon BBK KW V3 Supersprint Exhaust Procede
2008 135i Le Blue Alcon BBK JB4 Hartge Exhaust H&R Sway Bar M3 Suspension Forge DV Forge FMIC H&R premuim damper Kit