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Originally Posted by 4 cam tbird
An X or H pipe balances the two banks of cylinders and improves scavenging. That is the advanteage over straight pipes. An X-pipe makes very marginally more power than an H. I have seen back to back dyno tests in magazines resulting in fractions of a horsepower difference. So it is really not significant. An H pipe produces a deeper sound than an X. A Y pipe would be used if you don't have room for two pipes to route underneath the car. The Y would also have the balancing atributes that the X and H have although to maintain flow the single section of the Y has to be a bit bigger piping than the two pipes that feed into it.
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What he said, and X pipes use less material and no right angles. It is more easily seen when you have a butt load of torque. X pipes do work better then H and I have seen a few pulls myself and have an X on my 70 and that is why I went that route instead of H or reg dual.
Scavanging means the exhaust pulls on itself when the 2 banks meet, making for very little back pressure if any since it almost makes a pulsing vacuum of sorts (not quite below atmospheric pressure I bet durr). X pipes sound very distinct in the fact that you might have trouble telling which side is pulsing at the moment since the both run together. It is a very smooth sound under load and I dig it lol. :smt048 OH, and, no one will ever make you stall by putting something up one of your pipes. :}n