BH- The stock pipe mod, i have done to my stock pipe but got nothing but noise I have a 2001 220, If you look back on the KDX page and go through the mods you will find the pipe mod for the 93-94 i think it may make a little diffrence in your bike but nothing like a FMF Fatty- i guess if it were me i would study up on FMF FATTY pipe, I think that is also what Jeff Fredette recomends for his 93 200, this pipe should give you the best of both worlds. I wish that they were making the Fatty for newer models, i would of bought one. Well I know you will make the right choice. Good Luck