the hiss supposedly comes from too much exhaust flow, so anything that is less restrictive than stock cats will hiss, i think 
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2011 Gun Metallic 370Z Base w/ Sports Package 6MT
Mods: HKS Hi-Power, Test Pipes, Black Z1 Stillen G3s, Swift Springs, 20mm spacers F&R, AuCar 13.6' Android Screen, Backup Camera, G35 Homelink, Rear fog
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