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I saved mine in the garage just in case. I've said I'll never sell my car, but in case I need to swap back to the stock exhaust for any reason, it's there and ready.
I just had a quick question about the joe z exhaust. I didn't want to start a thread just for it. I understand that it deletes one of the cats on the car, but will the car still smog with the joe z exhaust?
As for the OP, I would suggest keeping the stock exhaust. I save all the stock parts on my cars when I mod it just in case for down the road.