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I know several people that have had their SVT's pass with hi flow cats. The cat back exhaust has nothing to do with smog. So what ever it is your running from the flex back is fine. So the only thing you need is either a stock cat or a HFC. Then take it to a shop that does a pre test. That will cost you about 20-30 if it fails. If it passes sweet, if not they'll tell you why and go from there.
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