Wesben
02-25-2004, 09:17 PM
:devil: Hey whats up ? can ya tell me what is supossed to happen when you add or remove those discs in the end of your pipe,I read once that it gives more bottom or top depending which way you go, but have not been able to find the right mag ( the old lady beter not have touched it ).Also I read in the latest mags that they tested a UM air box on a YFZ 450 and they say that they gained a few horse power, does anyone have any experience useing one of these, and did you notice any gains?:blah: