Quote:
Originally Posted by 370Z Purist
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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This.
And with that in mind, I am not aware of any dyno shootouts between the Nismo Weldina and the Nismo OEM, so its hard to say which of the two designs is "better".
Here's the real issue; For whatever reason, changing the pipe diameter from whatever it is on either results in a horrendously loud rasp on decel.
I hated it so much that my one attempt to go with a freer flowing Y-pipe convinced me to go back to the welded up Weldina
I know there's also some noise associated with the after market x pipe option some people go with... I love this motor, but it is as harmonious as a busted bagpipe if you have big transitions from one pipe to the next.