ZZP Catless 2.5" downpipe?
 

Dose anyone know how much of a gain i would get by adding this to the modds i already have? Im going no cat cuse the gm stage 3 pcm dosent turn on a ses light if you dont have the rear ho2s sensor not pluged in.

you'll pull pretty hard in high-inRPMs. better the flow = less heat/ friction = more useable power!

8 to 15 hp increase:twothumbs .... go catless



Mods: Injen CAI, ARK 2.5 inch catback exhaust, downpipe w/o cat, GMP Extrude Honed Header, meth injection walbro fuel pump, stage 3, 42# injectors, 2.7 pulley, Spec stage 2 clutch, Eibach sportline springs, Eibach sway bars, ca traction bars, DC front and rear strut bars, 3 gauge pod piller, plx wideband, autometer boost gauge, oil pressure gauge, and water temp gauge, halo projectors, 12000K hid kit, 5% tent... and more mods to come!

i wanna buy this, but im thinkin i need a cat for emissions and all that crap....

you dont need emissions on a new car until you sell it to someone and then they have to get emissions for it.... just keep your stock downpipe just incase



Mods: Injen CAI, ARK 2.5 inch catback exhaust, downpipe w/o cat, GMP Extrude Honed Header, meth injection walbro fuel pump, stage 3, 42# injectors, 2.7 pulley, Spec stage 2 clutch, Eibach sportline springs, Eibach sway bars, ca traction bars, DC front and rear strut bars, 3 gauge pod piller, plx wideband, autometer boost gauge, oil pressure gauge, and water temp gauge, halo projectors, 12000K hid kit, 5% tent... and more mods to come!

i think in pa i have to have a cat and a resonantor, i think, im not sure...