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Discussion Starter #1
I have an 89 CRX with a DOHC ZC. It has an HP Racing 4-2-1 header, no cat with the stock midpipe of the exhaust. I have a Ractive axle back exhaust, the piping from the axle to the muffler is 2.5 inches. I was just wondering what size piping i should use for the midpipe part of the exhaust? Is 2.5 inches to big?? I put the Ractive axle back on it with the stock midpipe and it was backfiring and running like crap, but after i took it off and reset the ecu it runs fine. Is it okay if it blows a 12 inch flame out of the exhaust when i rev it??
 

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93 civic
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do you plan on turboing anytime soon? if not go with a 2.25inch its perfect for n/a. but if you plan on boosting go with 2.5-3inch
 
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Discussion Starter #7
do you plan on turboing anytime soon?



Im planning on boosting it very soon with a custom kit im going to make, so ill probably just go with the 2.5 inch since that would work better with boost. Thanks guys
 
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