Wow, zombie thread for the lose.
It's pretty much the same, really. H pipes, if they're really H pipes, are crossover tubes. basically joins a true dual exhaust to mellow and deepen the sound. apparently also improves the behavior of the exhaust gasses for increased torque or horsepower or something. y pipe is just the section post cats in the Z that joins the exhaust stream together.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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