94 integra cat

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just go to ebay and get a high flow. there cheap and they hold up, I have had mine for 2 years and it sounds great and still has the polished finished
 
you can still pass emissions with a high flow, if you do however get a cel, there is a mode that you can do that tricks the ecu, it basically pull the o2 censor out of the bung farther and still reads normal to the ecu
 
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