Quote:
Originally Posted by AnalogMan
I know the biggest gain would come from deleting the cat (whether in the stock header or aftermarket). Unfortunately, the emissions regulations and inspections in my area mean that I have to keep it. I’m not even completely sure if it would pass with the aftermarket cat on a catted header, or with a tune (which is why I’m leaning to OFT so I can reset the tune at inspection time).
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https://www.mass.gov/service-details...le-inspections
Why are you speculating? It's an OBD test, you don't need to keep the cat to pass the test in MA, unless there's a visual component of it that I am missing.
There's no tailpipe test unless your local jurisdiction has stricter requirements.