I just bought a new 250ex about 3 weeks ago and i want to know how to get more performance and speed out of it. I want to buy a new exaust but i wanted to know if white brothers is better or if DG is better. What all can I do to this quad to make it faster, perform better and have better thottle response. Besides performance what is the best tires to get? Where is the best place to buy tires and exhaust for cheap?

 

There is not a lot you can do to the 250ex. Best place to buy parts and tires is rockymountainatv.com
I just put an FMF Megamax slip on muffler on my wife's 250ex. I also put on a Uniflo filter. I added 6 airbox vents to the airbox lid and jetted up to a 100 main and turned the air/fuel mixture screw out a 1/4 turn.
It makes a fairly good difference in the power of this quad.

 

a great exhaust for it the hmf sport series. i just got mine and it is great, huge power difference nice sound and looks great. and the people at hmf were a pleasure to work with. ( when i orderd my pipe i got the brushed alum. for no extra cost, and they later called and said it was out of stock so they gave me the red one with out charging the usual $20 more)

 

I put a White brothers E-series exhaust and a Uni-filter with 6 vents in the air box and went all the way to a 112 on the main jet and it runs great!! For tires I found Ronnies had the best price on a set of Razor2 and were here in 3 days. I love this little atv because its so trouble free. Just change the oil, clean the air filter and it will run for ever!