If you get the Stillen front bumper you gain abour 15HP but only 9HP without the bumper as tested on a dyno by MotoIQ Review and Independent Dyno Test
The Stillen exhaust sounds absolutely great and adds about 18HP. The combo definitely pulls harder than stock.
Gas mileage is most likely the same.
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Red 2010 370Z Roadster: Stillen G3, Stillen Exhaust, Up-Rev Tune (312 RWHP), Eibach Pro Springs, 20mm spacers front and back, Rear Camber Kit, Tinted Windows, GT-R Start Button, Interior Mods
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