I dont understand why everyone jumps to do exhaust work on these motors. They dont flow that poorly.
I doubt your loss in power is due to lack of backpressure.
hid lights hid kits
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's, ZHP knob, GROM, OEM 18's,