Hi Mate, the exhaust was done by Carline Mufflers Burleigh Heads Qld. I used the original exhaust headers cut off after the cat with a flange welded on the end. After that it does a U bend into a muffler mounted in front of the gearbox then straight back passing through a resonator then out the back with stainless tip to look the goods. The system size is 2” but he was going to go to 2.5” but reckons it would have been louder. A muffler midway definitely shuts up the noise but depends if you want that subie sound.