You need to hear the old original Hindle 4-1 with big tube pipes. They are killer. We are in fact in the middle of testing different exhausts and jet kit sets and will even be testing carb setups soon. So far we have a UFO dragstar, UFO 4-2, Kerker with one of our Carbon Mufflers, and a Big tube 4-1 Hindle. We are also testing the dyna 3000, Stage seven, raised stacks and my jet kit. I have a set of 39 flatslides, 41 flatsides, and maybe even a couple of other carb setups.
Everything is being documented and to make it fair we are tuning each system to the best we can get it.
All of it is being done on the same bike. Perhaps if anyone wants to send a header we don't have we can compare it too.
I will try to start a thread in the muscle section soon to keep everyone updated.
Sean