I have a 2003 400ex with k&n w/outerwears dynojet and pro circuit t4 complete exhaust and i was wondering what the next best mod to do. thanks for the imput

 

hmmm..maybe its time for some engine work

 

wanna know how to make it fast? well ill tell ya but keep it a secret. put a trailblazer 250 engine in it. lol jk. i would start with a pipe

 

I just put in a weisco 440 kit with 12.5-1 piston ,stage 2 hot cam and changed my jets.It made an awesome difference in power.I now have to change my sprockets because it hits the rev limiter too easy.Which is no problem because it will give me more top end.I am going 1 tooth bigger on the front and 2 smaller on the back,this should give me 15-20 mph more top end.(I LUV IT).My previous mods were FMF HI-FLO header
FMF powercore 4
K&N air filter
Dyno jet kit
Ill keep u posted on how much difference the sprockets make if you like.Also I use octane booster to be safe.(It will run good on pump gas).The 440 kit cost me $1225.00 (canadian) installed.Which I thought was an excellent price.

 

cam would be next than big bore than head work

 

call a engine builder like powroll sparks trinity, don't just throw parts at it.

 

thanks exkicksazz but i dont think i want to jump up to a 440 kit, ive heard many bad things about going that way. overheating, blowing head gaskets, and several others. instead i was thinking about a kit from powroll, a 415 kit with je 10.8:1 compression piston, along with it i was going to buy a stage 2 hotcam. would this make enough of a difference to bother?

 

FCR carb.........That's all I got to say.

 

why FCR carb, will the stocker not keep up with the larger displacement?

 

4life tell them about Levis 416