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Some people say they've had cat failure because they run nitrous. Is this common? Is it worth it to go with the test pipe, because then you'll need an o2 sim or wb? Thanks-

 
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Or get a high flow cat, and keep your car legal. Youll have a CEL w/out it.

 
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if you get test pipe then u need an o2 sim to get rid of CEL. I don't think you need wb though.

 
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if you get megan racing resonator, you will be able to have cel off with just a small mod that requires a spark plug non-fouler, I did mines that way with nitrous 80 shot and no cel problems. Some people say nitrous damages the stock cat, so buying a megan resonator for cheap wont hurt. Spark plug non fouler is 5 bucks and works good.

 
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im prb going with the HP full racing header wit the high flo cat. that would work perfectaas/

 
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I've run nitrous on my 00 odyssey for a few years now with no issues. i'm in the process of adding it to my 03 blown Si....I do have the Megan high flow cat however now...should have no issues.

 
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How will a hi flow cat effect emissions?

 
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well...i'm going to 'test' my setup at the local BMV soon. If not i'll have to swap the cat every 2 years. as long as they don't do a visual check and you don't have a CEL, you should be ok. I have heard that the Si will pass emmissions even without a cat! we'll see...i'll keep you poseted if I have it done.

it's such an easy swap, at least the megan stuff, that it's no issue for me to do it once every few years!

 
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Yea dude thanks, I'm curious of the results!