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Does the new KMS 3.5 inch down pipes give better exhaust flow combined with 3 inch Milltek 200 cell cat. Or should I get 3 inch down pine to match 3inch cat, will be fitted to MP350.Original exhaust will be retained.
 

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RS mk2 MR375
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Won't make any difference if you go 3.5 or 3". The original mp350 had a 2.75" down pipe. 3" is more available and will flow perfectly well without giving a step between downpipe and cat.
 
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