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well i installed on my EX an obx exaust with 21/2 inch pipe and im lossing alot of back preasure but thats not really the problem after i did that my friends told me to go with a high flow cat and i did everything was runing good but after i took it to the track to see how good i would do i did horable so the next day i wanted to go to the place i got my exaust install my car was acting a litle wird the rpms were runing alot lower than what they were supost too so after staling out a couple of times my car started idaling a litle wird it would go up to 1700 rpms and back down it goes up and down so i took it to my friend a "mechanic" and he desconected the TPS censor but now it idles at 2000 rpms and its really pising my off so please help me out

 
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Mad help hmm okay,Reset the ECU.....also was the high flow cat made for our cars?.. The cat has 2 sensors in it which are vital to the performance of thecars (<--mad help) Install the stock cat back.. reconnet the wires.. Reset your ECU.. done... and the 2.5" Exhaust just you about 11ft.lbs of torque and possible lost you some HP..

Cheers
Mohawk

 
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Hey Man,
When I owned my Integra the rpms would bounce up to 2500rpm and back down over and over and it was because a vacuum line got disconnected. That may be where your prob is. Good Luck. [IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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I've got an OBX cat-back exhaust and it works fine. I measured the pipe when I got it and it wasn't exaclty 2.5" a little less....