They claim that new STILLEN Y-pipe is constructed of 2 1/2" pipe up to 3" on the collector and is made of stainless steel. This mandrel bent pipe allows for smooth flow of gasses without restriction, bringing the increase of performance to 7 horsepower with an additional 3lbs of torque to your 350Z or G35 Coupe.

Can I use it with stock exhaust and just replace the factory Y pipe with this stillen Y pipe. Would I realize the HP gain

Any comments?

Thanks