Quote:
Originally posted by The Deuce
A true o/r X or H takes off the cats and moves the balancing tube up there. That's why they flow so well.
A traditional cat-back is from beyond the mufflers to the tips.
You can get a catted X or H that goes where the o/r pipe would, right behing the headers, but has high flow cats that should pass sniffer emmisions. Passing a CA visual is a whole different story.
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Even the stock H-pipe has a cross over tube....that's why it's called a H-pipe. A aftermarket peice just has a bigger diameter and either no cats or high flow cats.