Thanks for answers.
I found on thumpertalk store following 2 items
1. Akrapovic Ti/Ti 1820-0144 $635.3
DRZ400S 02-04
2. Yoshimura Offroad Pro Series Complete System(TRC) Titanium $670.46
DRZ400E 00-05
Is that akra exhaust going to fit on my bike(my guess that it will fit)
and what about that yoshi(my guess that it is not stright bolt on)
Also I was thinking of ordering JD jetting kit can I jet with that my stock carb and later buy that fcr.