M-Series (M1, M3, M5, M6)General M-Series Discussion - If it does not fit into a more specific M Category above, please place it in here. In addition, previously archived M-Series discussion is located in this section.
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Who makes the best headers for an S50 E36 M3. How much bhp do they add? Also who makes the best midpiping? and how much Hp? Active autowere makes Midpipes but they sound raspy and have no cats so i would half to uninstall them every year and put stock ones in.
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