head pipe/ bill's pipes

[blue]

what is the difference between the stock head pipe and an aftermarket head pipe? i dont no if i should get a slip on or a compleat system. also does anybody have a bill's complete system? is it loud? does it have power?

[Florida400EX]

I don't have any info on the bill's, but I can tell you that I've personally never seen anybody on here with a bill's pipe. They are good for dirtbikes I know that. I run a full pro circuit pipe, and no complains here! :cool:

I ran a bills slip-on for about 2 years. Good pipe but I think the craftsmanship and quality of an HMF is better.