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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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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