Yup, I would only buy a matched set (software, intake, exhaust), or you risk losing power.
Originally Posted by philippek
Welcome to BMW. You're not going to find inexpensive aftermarket performance parts, and frankly if you did I think you should steer away from them. Also, a couple of posters here have reported that their vehicles actually produced less
power after doing things like intake and exhaust.
Enjoy your car and save up for an M3
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