jaspittman

i am going to have two muffler tubes made up that run from my exhaust manifold to the stock cat-back system. i am going with seprate tubes (no h or x configuration) high flow cats and cutouts. do i have to install the cutout after the cat. if i install the cutout after the first O2 sensor but before the cat will the O2 sensor from behind the cat send a service error light when the cutout is open. what kind of hp gain is seen over stock for the above configuratation.