if a catback system comes with build in resonator, does that mean i can take off the stock catalytic converterand bolt it up to the down pipe that comes with the aftermarket header?or do i need a test pipe? if so does anyone know where i can find the stock catalytic converter dimensions, so i can have the correct length/inlet/outletdimensions for the test pipe?? thanks

 

removing the cat harms the environment and gains you pretty much nothing

don't do it!

get a high flow cat from magnaflow or someone similar