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post #4 of (permalink) Old 03-17-2018
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Beechkid's Avatar
Joined: Apr 2013
Location: SoCal
Posts: 4,513
My question is "why do you want to change...there is not flow increase, etc ..... nor is there really anthing such as a "high Flow cat" in the aftermarket world..............

Here's a link to a "Real Test" that verifies....on a700+ hp gain or loss of with or without the cats!

The myth about high flow cats

Under federal regs………up to $2,500 for modifying any emissioncontrol device….and lets face it, for the few hp (if any) you will gain byswitching to “high Flow Cats”, that $2,500 can buy a lot of real performance!

Straight from the EPA's page and the Federal law trumps statelaws, it might pass emissions but ever get a cop with “wanting a reason” foryou and you can get hit pretty good.

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