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Hi,
Can anyone give advice on hi-flow cats to compliment the z06 exhaust.
Are the Z06 cats different than stock vettes?
Is the Z06 exhaust open enough to warrant hi-flow cats,
I would do the Random Tech cats, you will pick up about 5 RWHP but the real gain will be in sound. Removing the stockers will let out a lot more of the V8 sound if you still have the stock mufflers. The stock Z06 cats are the same as all other Vetts I think the Z06 doesn't use the pre-cats and that's how they get a little more flow out of it's system. I would change the cats first and see what you think of the sound and if you want more sound after that then put on a Cat-Back and truly take advantage of better flow.