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I have been reading up and some say it throws a check engine with a test pipe and some dont say anything. If it does what do you guys use to correct it
 

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i put in a 02 extension from a company and i have never had the CEL come on for that.
 

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Mine didn't, but I had the extension specially set up, and never saw another CEL (caused by the removal of the cat) again.
 

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Old thread but thought I could help out as its a common problem.

Ultimate Racing sells a 3'' testpipe with cel fix for 75.00.. (built in anti-fouler) its hard to go wrong if you can find one (lancershop.com has them)

You can build your anti foulers very easily so the 02 sensor reads further away from the exhaust... just search it
 
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