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I really didn't notice any increase in smoke or fumes when I switched my old cat for a M&K premuffler. I put in a SW chip and a new O2 sensor at the same time. Heck, the looks alone of the M&K premuffler over the old rusty cat is enough reason for me to keep it.
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2009 Porsche Cayenne Turbo S; 2019 Corvette Grand Sport Coupe; 1998 Porsche Boxster; 1989 Toyota Supra ChumpCar; 1989 Alfa Romeo Spider; 1977 Porsche 911S Targa 3.2L"Bwunhilde II" chimera; 1970 Datsun 240Z 2.9L "dogZilla" project
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