go wit white bros. e-series and a K&N power kit................it did wonders for my EX

 

Hello,
I aggree with Wiztech. I put alot of cash into my 300 EX motor and it is still a great machine. However for the cash I put into it I could of gone and got a 400EX and spent the cash on suspention and a few other motor mods and made it a really great machine. But we all live and learn. If you are screaming for more power now after just getting the machine then a 400 EX is what you want, and then put it into tires rims shocks A-arms etc. The machine should last a lifetime then.