Quote:
Originally Posted by FTemplar
I have this FT86 catted header, I just assumed that's what we were talking about because of the thread... but yeah I understand, thanks 
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thought you had stock header, and a catback. Unfortunately it possible to get P0420 with any aftermarket header, catted one vastly reduce possibility but no 100% guarantee, few people in this thread get the CEL but many dont. The CAT is likely ok if its a speedfactory header The speedfactory cat is much more robust than the stock ceramic cat in stock header.. Check for exhaust leaks though and always use new gaskets when fitting a header reused gaskets will almost certianly leak after a while causing problems.