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Old 02-19-2017, 02:50 PM   #2 (permalink)
2011 Nismo#91
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Generally because of money. A well designed system be it Y, H, or X will all make about the same power. But typically a single pipe (Y) will usually produce less power because they are designed for economy rather then power but there are exceptions to every rule. H setups are easy to make but you still need 2 pipes rather then 1. X pipes are generally the best but also the hardest to make.
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