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Old 21-08-2014, 11:18 AM
siwilson siwilson is offline
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Join Date: Aug 2006
Posts: 355

Originally Posted by Freddy View Post
Here in Norway the headers are different, the catalyst is in the headers. The E46 M3's sold here does not have catalysts in the headers.
US E46 M3 and Z3M models also have the cats in the headers causing a 10 BHP loss for both models. This is one reason why Euro style headers are a popular mod over there.

I think the power difference is really down to several factors. Different intake and exhaust systems, lower redline and DME programming. I am also sure BMW were keen to put some distance between Z3M and M3 version for marketing purposes. A bit line Porsche do with the Boxster, Caymen and 911.

There is a project underway in the US to reprogram the DME and get this power back as well as enable the sport mode in the proper way. Thread here

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