the toomey racing series were first produced when the banshees themselves debuied. they have great mid to top end power. if you can pop the clutch they are great. i use the t-6 but they arent forr a bike that you are planning to do major modding. if you plan to put some serious cash into it then go with the t-5. they are great for stock and modified. but any after market pipe is better than stock. just stick with the pipes that you like. then go from there