im going with the bill ballance pipe

[quads14589]

i think that this pipe will be the best for my 400ex with low end and power gain then in the future buy some cams.

[oldskoolex400]

i think you mean cam

[rooster300ex]

That pipe is a good choice. Yea the 400ex engine is a SOHC(singe overhead cam). Which means there is only 1 camshaft. You could of acidentally put an s on the end of cam for all I know, but if ya didn't you just learned something about your quad. Which is a good thing. Thats what this place is for.

[oldskoolex400]

i like the tip of the pipe its a bamf though