will a jet kit from dyno-jet for the 95-04 models work on a 05 s-40. is the carb and all the same.

would you care to elaborate. i plan on upgrading the exhaust and intake so i will need more fuel.

Yeah, unless you'll be taking advantage of the free dyno run certificate included in the package from DynoJet, it's way too expensive for what you get.  With the jets running $3.00 to $3.75 each, the above advice is good.  Just read the stuff in the Technical Corner (especially the bold all caps post at the top) and do a couple searches on rejetting, white spacer, etc.  You should get a really good idea of what all is involved.  It's not difficult at all but you will get to remove the seat and tank.  That's a good thing to be comfortable with though.  It seems like I have to remove at least the seat and often the tank for most activities.  Hmmm, ya know?  I didn't need to remove either one to change the shocks!  Whoa!