Here is my setup. I deleted the back CATS went directly into a "Y" with a 3 inch outlet. Then a 3 inch pipe through a 3 x 12 inch resonator directly to the stock muffler, removed the OEM resonatot, then into "big" round tips. Sound is deep and throaty until the SC kicks in then it's almost Ferrari like. I eliminated all the twists and turns, a lot of weight and get a scavenging effect since the "Y" is as close to the engine as I could get. Luckily I have my own welder and pipe bender so that saves a ton.