ok i got a 2000 hond 400ex it has a k&n air filter, weisco piston,fmf mega max scilencer.

How much more power would i get if i put jet kits, stage 1 hotcam and a header.

would i be able to feel the difference

 

ok you are running a weisco piston and k/n and FMF pipe on stock jetting??? either thats or im reading it wrong...


but if you mean just changing the jetting again then yes ive heard the hot cam is a good mod... i dont do engine mods cause i like my **** to be running and not parked waiting for parts to piece back the grenade.. i think you got plenty of power with mods you already got done.. if not... then trade up for new TRX450 or YFZ..

 

If you hevent jetted it better you would be able to feel the difference. And that cam will do some good. You may also consider porting, i dont think its that much for a 4 stroke.