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x6xdrive50i · 01-27-2010, 07:05 AM

I guess the OEM exhaust is very efficient then if an aftermarket one is claiming to add only 5hp. I recall how crazy the R34 GTR can gain hp with an aftermarket catback. That said, the Hartge sounds pretty nice.

01-27-2010, 07:05 AM	#21
x6xdrive50i Enlisted Member 2 Rep 44 Posts Drives: 2010 X6 50I Join Date: Dec 2009 Location: Sydney Australia iTrader: (0)	I guess the OEM exhaust is very efficient then if an aftermarket one is claiming to add only 5hp. I recall how crazy the R34 GTR can gain hp with an aftermarket catback. That said, the Hartge sounds pretty nice.
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