sorry to hijack, but i just have a quick question (searched but had no luck..):
i have a 328Ci and i'm about to put some ebay headers on it. how much hp would the new headers alone with the stock 328 exhaust add? also, say i were to get 330 headers and a 330 dual exhaust, how much hp would that add?
2003.5 LSB/black M3 - 6MT - No Sunroof
Carbonio carbon fiber intake, Evosport pulleys
SS V1 Stepped Headers, SS cats, SS X-Pipe, custom muffler delete
Bilstein PSS9 coilovers, HPF subframe reinforcement
GSG Motorsports cross drilled/slotted rotors, StopTech pads, VarrsToen 1.1.2 wheels (19x9.5 ET20, 19x11 ET25)
OEM Euro bumper, Seibon CSL trunk, black kidney grills & side gills, smoked OEM LED taillights, smoked corner lights & sidemarkers