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No, you won't pass if they see it. And it probly won't pass the exhaust probe test either. I heard a rumor about a Magnaflow CARB legal mid-pipe coming out soon, but there isn't any aftermarket mid-pipe that is legal for our year mustangs in CA.
I was told it doesn't matter what kind of pipe it is, you just need 4 cats because thats how it came from the factory. So you might be able to just weld in 2 more cats.
I was told it doesn't matter what kind of pipe it is, you just need 4 cats because thats how it came from the factory. So you might be able to just weld in 2 more cats.
Not in CA. The midpipe has to be the STOCK pipe. The replacement midpipes don't all have OBDII certified cats. Just having 4 cats MIGHT pass the exhaust test, but it will not pass the visual.