Quote:
Originally Posted by mpg_numbers_guy
If it's P0420 then replacing the other piping won't fix it; it needs a replacement catalytic. You could probably try cleaning it too. RockAuto has good prices on aftermarket catalytics, or you could just straight pipe it with an O2 fooler.
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WV doesn’t do any emissions testing, and part of the build involves increasing power to make better pulse/glide length ratio, so I planned on a cat delete and upgraded exhaust... in addition, I can have the exhaust guy take special care to tuck the pipe up tight to the underbody and my new muffler is flatter than the stock one, so I should be able to make a nicer rear diffuser without having to cut out around part of the muffler...