ok im going to get exhaust and jets and i have the filter i was wondering what jets come stock on a 03 400ex and what i should jets i should go to with all that i am going to drop a tooth too but im not sure if its going to matter let me know what you think or if you know whats the stock jet thanks

 

generally exhaust kits come with a jet kit that is made to work with the stock carb and that particular pipe.

 

ok but with the filter ill probly need a different one but maybe not

 

the jet that comes with the pipe should be fine. i run a k&n air filter (soon to be UNI) and 7 1-1/4 inch holes in my airbox lid no jet change and it runs fine.