There are difference in the X or Y pipe and the H-Pipe for sure - which allows the NISMO to pick up additional HP on the "regular" Z's, but essentially, apart from the cross connection design, the exhausts are duals.
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BD2ZBN :: 2011 BSM/TRG/SP/6MT/Stillen Oil Cooler/K&N CAI/Michelin PSS/Brake Light/EIBACH Sway Bars/FI Res. HFC+18" Res. CBE/Morimoto XB LED/DRLs/10mm Spacers
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