Quote:
Originally Posted by s1csl
M3 cats are 200cell, european cars , the CSL cat was a bit lighter but still a 200cell cat that's why it had a different part number, the yanks had the 400 cell cats on there M3s because of there strict EM laws, that's why they did not get the CSL
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Yanks have cats in the manifolds too, that's why they buy the European manifolds.
I'm certain the standard m3 cats are not 200 cell though.