best big bore kit for 400ex

I do mostly trail riding, some small hill climbing and the occasional drag race. Which kit will give me the most for my money. 415,416,440?? Which company WB, Powroll???

i think the 416 kit will give you the most reliable performance for what your looking for. For me, all i want to do is be able to beat a raptor, banshee and a scrambler 500 with nos. I'm planning on getting the 416 kit with an quicksilver carb.

oh yea you should also fix your clutch lever and get a 14t :devil

MOMMA!!!!

I also think you should calm down and maybe even put your carb back together so we can ride butthead

u still cant beat me fool!!!!