Pre-Silencer to the muffelotta, then into a 'rotary proof' repacked stainless muffler, then into Supertrapp w/20 discs. All mufflers are straight through design, tubing starts as 2.5 at the presilencer, then goes to 3" before the muffelotta. The 180* bends required are 3" mandrel on 6" radius. There is no more space for additional mufflers on this car..