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I've been monitoring this site for some time to get a grasp of good mods for my 2010 LS3 M6, I was about to push the button for 2 thousand dollar header with cats and xpipe untill I read all the trouble they are causeing with codes from o2 sensors being relocated, are there any Header with cats and xpipe with good hp & tq gains that do not throw codes???
 

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Short answer, no.
The reason they throw codes, is because the long tubes move the catalytic converters farther away from heat, which causes them to get to operating temperature slower, which causes the computer to think they have failed, which then illuminates the CEL.
A tune is needed to stop the CEL from coming on, and to pass emissions and run well. Plus, due to the huge difference, a tune is highly recommended to make the engine run safer, and get more power. Every once in a long while, you'll see a car without a tune that does not illuminate the CEL for a long time. But a tune is recommended. Shorty headers will not cause the CEL to come on, but they do not produce much power either.
($2000?
)


:chevy:
- Jeremy
 

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You can go the Doug Thorley Shorty Headers. Will not produce as much HP as the long tubes but they are defintely worth there money. Had about a 7hp gain at a recent dyno with the Shortys on my V6. A guy in our club put them on his V8 and loves the sound and performance they make. And no they do not throw codes and you don't need a tune.
 

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No, an exhaust will not, unless it is installed poorly and rattles on something, then the computer may think the engine is knocking, and may cause problems then.

- Jeremy :chevy:
 

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I would do some more searching as there are THOUSANDS of people with success stories and no codes.......
 

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$2k :facepalm: is a bit pricey. Pretty sure you could get what you want for much less than that. As for the headers and codes. As mentioned, you could do a set up with shorty headers and not throw codes but you'll only get small gains. If you get long tube headers and don't tune, more than likely, you'll get the dreaded CEL. I tried that route and did all the tricks out there that I could find and the best I could do was about 300 miles before the CEL would show up :( The car ran ok, but was not optimum and gas mileage suffered and really didn't notice much benefit to the headers etc. If you get a tune for the long tubes, you'll get the most out of the car, it'll run better and you'll notice the extra hp/tq.
 
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