Hey has anyone on here custom made their exhaust muffler for their bike? It doesn't look that difficult at all to make! I've got a friend that is a millrite and metal fab journeyman. He knows his shit. Anyone know what exactly is in the internals of a pipe like Akrapovic or Yoshimura... I've bought Akrapovic pipes for my last two bikes... i just can't justify spending that much anymore. So I thought I would get my own made. Its for an 05 ZX6R. So half the shit for the bike isn't even out yet. Any info... pics... ideas would be greatly appreciated.