What kind of performance gains?

[250exDaniel]

What kind of performance gains would I get if I added this to my 250ex.

Powroll big bore kit
T-4 exhaust
K&n air filter and K&n jet kit

How much of a difference would I feel?

[wheeltrax]

you will have noticeable gains.. engine kits are one of the biggest things you can do to increase power. It will be like night and day. the only drawback with the 250ex and doing that, is you cant adjust the sprockets for ratios. your stuck with a shaft.. but you will still notice power, its just you cant gear it any different really.

[promisc]

Buy a bigger bike dan. dont waste your money on that pony

[stupid driver]

I think you will be quite impressed with the gains. I love those 250's. They are so much fun to ride. It wheelies forever.........
Its a great trail machine as well. Get the kit, you will like

[EX LONERIDER]

are those 250's a 4 valve head design? if so then do it........ otherwise put the money into a 400.