Originally posted by Shingoblade-GSR
I'm assuming there are some high-flow cats that still pass California emissions laws/tests?
comptech did a dyno run on a gsr with its intake/header/exhaust, measured max 20 hp gain to the wheels. As far as i know the rest of the car was stock, so I'm still be happy knowing these mods should add this much power. :thumbup:
From what I have read, people have passed the cali emissions tests with carsounds cats.
Its hard to trust dynos directly from manufactures. Its very easy to manipulate results... but if it is true, and the i/h/e alone gave it 20whp, imagine what an unbottlenecked exhaust would result in.
Because currently you have a 2.25" exhaust setup, but a 2" cat. Obviously its hard to get opimal exhaust flow with this bottleneck.
So, basicly I am just recommending that people should look into getting a highflow cat before diving into cams. (the expense of cams, cam gears, springs, retainers, tuning, etc is tons more than a cat)
