thy hook up to my stock mufflers just behind the rear diff. i have dmh electric cut outs so i keep my stock mufflers . if im not mistaken thy offer a complet exh. with mufflers now give Nick @ ARH a call and ask . his # is 631-608-1986. ill try to find my dyno video for you to lisen to . it was with the cut outs open , cam & tune only before my D1-sc procharger