Quote:
Originally Posted by BimmerZealot
If you have a pre-Nseries engine Z4 then you have a huge selection of headers because it shares the M54 engine with the E46 3-series. There is a thread on e46fanatics.com that documents the proven "eBay headers" for the M54 engine. N52 engine thats a whole different story.
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I just got these headers. I think I will need O2 sensor extenders.