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
Performance: Carbonio Carbon Fiber Intake
Suspension: Bilstein PSS9 coilovers
Wheels: SSR GT3 19x8.5/19x10 - Yokohama Advan AD08
Exterior: Matte Black Kidney Grilles & Side Grilles, Smoked Corner Lights & Turn Signals
Factory Options: Navi, full power heated seats w/ lumbar support