Funny my car is a Ca, car so Ca and NY have a special cat

? Lamo every state besides Ca and NY can run the high flow design but me lol

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I know zzp used to sell the down pipe by itself but now it's part of a tune package not bad but 699 .? I have the trifecta turbo Advantage tune already and my car passed the Ca emissions test with it on , from what I was told by trifecta the tune does not alter emissions it basically 90% transmission they have the turbo tied in to the rpm and shift points .
I'm not wanting to add more co2 to the atmosphere but un cork the dang plug they put right at the exhaust exit the high flow cats are anywhere from 66 bucks to 114 on e bay the 400 cel vs 6 to 800 cel 400 being the higher flow design .
The 02 sensor is actually before the cat and the computer is perfectly tuned at all times anyway I might try it .