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Discussion Starter #1
I found a Magnaflow catback 3" exhaust with high flow cat. What header is recommended for a 3" exhaust? '02 ZX3 is currently not modded.
 

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You're going to lose more than you'll gain with a 3" exhaust. SVT header is the best for HP gain. You'll need a tune.

1turbofocus can help you there.
 

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You wont loose anything and the gains will be well worth the 3 inch , The SVT header is the way to go and do a 3 inch off road pipe from header to the Exh

Your going to need a Tune as well as a wide band air fuel gauge

Tom
 

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Discussion Starter #4
Tom
I can't seem to find a 3" ORP. Biggest ORP and high flow cat I can find is 2.5" from CFM. Do you think an ORP is best? I've read that the rear O2 sensor would need deleted by a tune.
 
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