I have a 400 Ex with a 10:1 piston, white brothers race cam, big gun exhaust, jet kit, k&n filter, rev limiter and soon 16 tooth front sprocket. which would be the faster machine in a drag race mine or a 440 EX with just a e series exhaust?

 

I wouldn't be afraid to race the 440 if i were you. You might walk away from the 440 on top-end.