12 With the head pipes designed, it was time to put the mufflers in their spots, which is normally right in front of the rear axle. This is usually the area under the rear seat and the floorpan, which is raised up to give the mufflers more clearance. Also, you can see that the mufflers are pretty close together while the head pipes are much wider. We hooked the two sections of tubing made specifically to bring the system close together to the head pipes. You want the system to run right next to the driveshaft, that's where the most room is.