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Wow, great build & thread. Don't know how I haven't caught this one till now, I mostly stick to the 128i/N52, Susp & Brakes, and Wheel/Tire forums on this site....caught this by accident almost lol.
I have a question on the AFE headers, they are the only performance headers I know of for the N52 that have Catalytics, haven't seen too many / if any people with this. How did you find the fit and quality? Any thoughts on performance gain from them? I know the Supersprint and AA headers make for decent gains, just don't have any real world feedback on the AFE model.
TIA.
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