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Old 08-16-2009, 07:39 PM   #1
Corvin
 
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ARH Headers Question

Now anyone correct me if I'm wrong but I was under the impression that installing these makes your car have error codes. If this is true has there been any word on a fix for it?
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Old 08-16-2009, 08:09 PM   #2
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i have installed several of the long tube header set ups with the small bullet cats and all of them have eventually set the p0420/421 cat efficiency codes, these were not the arh headers but other brands that have the same style small bullet cats

only way to fix it is to have a tune done and turn off the codes
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Old 08-16-2009, 08:17 PM   #3
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But wouldn't that show up when you have your emissions test done and cause it to fail?
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2SS/RS - SIM M6 Order# NKNBS6 Reordered on 6/9/09 2G1FT1EW0A9134351 Born on date = 8/10/09
1100, Preliminary order accepted 6/9/09
3000, Order accepted by production control6/27/09
3100, Order available to sequence7/20/09
3300, Order scheduled for production7/20/09 TPW 8/03/09
3400, Order broadcast08/07/09
3800, Order produced08/10/09 2G1FT1EW0A9134351
4000, Available to ship08/11/09
4200, Shipped08/11/09
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Old 08-16-2009, 08:28 PM   #4
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Quote:
Originally Posted by Corvin View Post
But wouldn't that show up when you have your emissions test done and cause it to fail?
Yes. Long tube headers and cats will cause your car to fail the emission test if you live in an area that does it.
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Old 08-16-2009, 08:30 PM   #5
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But wouldn't that show up when you have your emissions test done and cause it to fail?
yes if the code is current,, from what i have seen these small bullet converters are hit and miss,, sometimes when the ecm runs the cat efficiency test they will pass then sometimes they wont. your ecm is always doing emmision test while you drive, all depending on your driving cycle/ style of driving
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Old 08-17-2009, 10:35 AM   #6
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I've put LT headers on my 02 Camaro SS(FLP) and my 05 Corvette(Kooks). I have never thrown a code with either one at anytime. Some will and some won't.
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Old 08-17-2009, 03:51 PM   #7
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Guys, This is always a popular question. The easiest fix, and consequently what produces the best results, is a tune. This eliminates any possibility of a CEL and at the same time boosts performance throughout the RPM range. Regardless of headers used, tuning is a must.

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Old 08-17-2009, 03:53 PM   #8
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but even with a tune will it fail emissions testing??
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Old 08-17-2009, 04:03 PM   #9
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but even with a tune will it fail emissions testing??
no a lot of times with high flow cats you will still pass the sniffer with the same or better and you can pass even easier if the cats are nice and hot so get on it when going to get the inspection lol

but if you don't live in a state that has to pass the sniffer all they do is hook up the obdII check for codes and a visual inspection which i easy to pass because most don't care and the others just look see the cats and have no idea if they are factory location or not so pass
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