I have the PE in my car but only installed the rear muffler section, leaving the resonator from section as is. As I have an N55 the sound is awesome and there is no drone. The exhaust gives the car a nice exotic sound at part throttle and is clearly louder than stock at WOT. I never installed the y pipe because I didn't want excessive noise and the N55 is already louder in stock form than the N54.
12' 135i DCT, Convertible, Triple black, Nav, Apps, BMW Shadow Grilles, LCD interior lighting, BMW PE, Michelin PSS.
06' M Roadster, SMB/Red, AA Tune, K&N, Remus Exhaust, ZHP shift knob, Hyperblack M Rims.
09' BMW 328i Touring, Monaco Blue, Panoramic roof, Nav.