Ford Focus Forum, Ford Focus ST Forum - View Single Post - The duratec long tube headers fit!!! (no check engine light)
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Old 04-18-2012, 09:33 PM   #13
FocusBoy58
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Quote:
Originally Posted by darkangelism View Post
yeah there is no way that will pass in california, no cat is illegal at the fedreal level, but unless the car was impounded for some other reason they would never know.

That being said in some states, not cali, an aftermarket hi-flow cat would be enough to be legal, though you would lose most of the benefit of the new headers.

@focusboy
Are you going to dyno soon? thanks for testing this out first.
Yes I will shortly after I get some copper core spark plugs and gap them. Also have to put my Intake back on. Thinking about actually getting the AEM Cold air intake to compare to the K&N Cold air Ive been testing.
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