mine are 3 1/2' w/ my home made (KINDA), mufflers ,w/ turn downs in front of the rear axle, I built the same for a hot 406 sbc in a 93 GMC, decided to have the 3" dual ran over the axle and turned out behind the rear tires lke a camaro. I could tell the diff. when I backed out of the muffler shop bay, drove it home and pulled them off,
They are still in the barn !
