jaspittman

i am going to have two muffler tubes made that run from the exhaust manifol to the stock cat-back system. i am going with seperate pipes (no h or x configuration) that have a high flow cat and exhaust cutouts. do i have to install the cutouts after the cats. if i instal the cutout before the cat will the O2 sensor cause the check engine light to come on once the cutout is open.