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JerTM · 09-05-2018, 06:33 PM

I'd seal it up, but I'm certain it's your cats. They aren't as efficient at cleaning up the exhaust as a factory cat.

09-05-2018, 06:33 PM	#2
JerTM Drives: 2011 2SS/RS M6 Join Date: Oct 2015 Location: Utah Posts: 1,940	I'd seal it up, but I'm certain it's your cats. They aren't as efficient at cleaning up the exhaust as a factory cat.