Here's my 36 frame with dual 2 1/2" S.S. exhaust through the frame. The front openings were elongated so the tubing can come straight back, and the rear comes through perpendicular to the hole so there's no problem. Through the mufflers, over the rear axle, under the tank and out. I didn't want anything hanging down under the frame, especially in the middle because I have a hump (sort of like a speed bump) at the end of my driveway to get into the street.