Just wanted to let people know that the duncan full exahust with a K&N, a duncan jet kit and no lid or snorkel makes a huge difference in performance. This kit is awesome and only cost me 500.00 for everything. It wiped up the ground with a slightly modified banshee. It sounds mean as he## and gives this Z a totally new attitude. I can not wait to ride it up tower city, pa to see how it performs on the hills. In the woods it is a beast.