What mufflers,do you have now,John?... A friend had a way overbuilt 327 small journal ,with 3" exhaust out the sides(66 Nova..) He had packed mufflers from "Raven" ,a straight through design... Sounded like two uncorked Harleys,rolling down the boulevard... He was broke,all we had lying around was burnt out Magnaflows..We repacked the Magnaflows,installed inline.. That car was as quiet,as a mouse afterwards. Love the work,on the Funny...