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03-31-2001, 01:52 PM
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Registered Member
Join Date: Jan 2000
Location: east hartford ct us
Posts: 21
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Ever fail emissions with a mac (cat) h-pipe?
Went to emissions with my 95 GT and failed for nox. I was just about double the allowed limit. The car has 60k and motor wise its pretty much stock, full exhaust,with the mac (cat) h-pipe, pulleys, maf. The timming is set about stock, 11. I was told that the 2 main reasons why a car fails for nox is eiter bad cats or carbon build up. I doubt its carbon, but if it failed because the 2 cats wernt enough that pisses me off!! Anyone else have this problem??
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