it will increase the eng performance plus increase the noise. Mandrel bends & an X pipe works well & in addition glasspacks alonside the leaf springs will allow you to use more freeflowing (louder) regular type muffs up front & still have adequate overall noise control. Dynamax hemi turbos get good reviews here & cheap parts house "cherry bomb" glasspacks have outward punched louvers & do not neckdown where the nipples are welded to the main case & are cheap & do work.