need info on aftermarket parts

[hmf400]

i just bought a new 07 dvx 400 and was wondering which aftermarket pipe will get me the best power gains and sound, does anybody have a motoworks i have been hearing alot about them. and is a k/n or uni air filter better

[05Z400rdr]

Exhaust: Yoshimura first choice, HMF second

Filter: K&N

on my z i had a full yoshi tri-oval exhaust and k&n filter

[z40021]

My pipe choice would be between the Curtis Sparks, Yosh tri-oval, and the Rossier shrt version.
I have the Ros. shorter version.

And as for the filter I would get a K&N with the pro flow kit(adapter).

[Byte]

I use full HMF and K&N.

[Mav_KFX400]

I have Yosh and i love it, and it sounds great. K&N filters are nice but i would get a prefilter with it