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I Have A 01 V6, I Recently Installed A MAC OFF ROAD H-Pipe, WITH NO CATS, Is There A Significance In That? Does That Give More Power?, And My Second Queston Is My Check Engine Light Is On, I Think Because Of The Switch Over. I Have All The Connection For The O2 SENSORS, But THe Light Recently Cam Back On?? WHAT THE PROBLEM? If Any Of U Guys Know Hit Me UP!
 

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th o/r hpipe does give u more power because the exhaust flows better without the cats. the check engine light is on because the rear O2 sensor is reading that there are no cats. u need to either get a Mil eliminator or a tuner that can eliminate the rear O2 sensors.
 

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If you dont want to buy them, I have a website you can go to and build your own. If your pretty handy with a soldering gun. Its not that hard actually, I just made one for my civic. And I think im going to have to make two for my brothers gt.
 

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On a stock Motor a H-pipe is minimal HP gain. Really more of a sound increase than anything. You can get mil's or you can get a Chip or custom tune but I would only go that way when you have some more mods like rearend gears.
 

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You probably lost a lot of low end torque with that swap actually. And yes, you need some mil eliminators to get rid of the light.
 
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