HPF exhaust vs. AA exhaust?
Currently stuck between the two!
Differences I've noticed:
-HPF is a single 3.5" pipe from the DP back to dual tips
-HPF uses a single 14" resonator
-HPF uses a flex section (which helps when the engine moves around)
-AA is a dual exhaust from the DP back
-AA uses an x-pipe
-AA uses dual mufflers at the rear
HPF is $1595
AA is $1890
Opinions and soundclips of AA and HPF exhausts on an N55 car would be greatly appreciated!
2011 335i sedan 6MT, JB4 w/FlexFuel wires, AA 4" DP, VRSF 7" FMIC, AA turbo-back exhaust, ER CP, BMS OCC, Arkym CF trunk
2000 M5, LeMans Blue, H&R coilovers, custom exhaust. SOLD
1995 M3, Schrick cams, Euro HFM, 24 lbs injectors, AA exhaust, Conforti chip, UUC LTW flywheel, UUC performance organic clutch. SOLD
Last edited by hetzle; 07-11-2012 at 11:49 PM.