Quote:
Originally Posted by schumacher86
Did you get rid of the secondary cats as well? Or just replace the primary OE cats with high flow and keep the secondaries?
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on my m5 i got rid of the secondaries. on my 911 i have sport cats and it stinks.
the m5 doesn't smell that much there is a hint of it in the air but it's perfectly acceptable.
on the m3 i'd definitely advise on keeping the stock cats in place