Hi,
I just spoke to Max at Stillen he suggested that there were some benefits to each type of exhaust configuration , that at Stillen they tested both and felt that the “Y” seemed to give more gains and preformed best on the 370Z, engine and overall configuration than the “X” .
This may also be possibly why the OEM configuration is a “Y” type all be it much more constrictive then the Stillen design.
Thanks,
Alex
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Stillen G3-CAI , CBE , Grounding kit // Berk HFC // Eibach Sway Bars // Rear Spoiler // Kick Plates // Fog Light // Escort 9500ix-Shifters ZR4 // Gentex-51A // Next: Stillen 25 row Oil Cooler , Crank Pulley // O.Z. Botticelli III // KW-V3
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