I have run the fatty and now have the gnarly pipe on my 99. The gnarly does help the bottom pull more. I had read that the stock pipe was very good, but am looking to buy one (hopefully cheap) to try out against the gnarly. I have a 12oz. flywheel weight that has helped a great deal with smoothing out the powerband. This bike has a very strong pull right off the bottom, but smooth. I have pro series reeds also. I also tried a powervalve spacer, which is currently still on the bike. It gave the bike a little more bottom. For hillclimbing, it pulls like a tractor, and is very hard to stall. I currently run a 45 pilot, stock needle, and 175 main, which is quite a bit leaner than stock, but I am at sea level. As mentioned above, the bike doesn't have much overrev. It really likes to be short-shifted. Once used to the bike, I love the powerband. Whenever I ride my friend's '02, I am constantly missing all of my lowend.