how do these pipes perform on a 400 ex?
sound?
how loud?
power gains? where @ in power band?

 

I'm not sure about the EX version, but Xplor just got the HMF for his Raptor...
He got the full system, with silentcore (or quietcore or however it's called...the quiet version). At first he was kinda disappointed with it (minimal power gain), as stock sound (not volume, but really the tone was just like stock). He was almost unhappy. Then he removed the airbox lid...and everything changed. Sound became cool, but not overloud, and power gain (I only felt the difference on low end...since I can't feel any power at high rpm on those thumpers...). The very low end knocking completely disappeared...it just bogs when starting from idle in second gear (probably a jetting question).

He will tell you more as soon as he comes back...

 

My friend just got one on wednesday, but ive been at work and havent seen it yet .but im going riding sunday with him i can let u no sunday nite

2001 Red 400Ex
Ac Nerfs and bumper
20/11/9 rear shreaders, Red Renthal bars and CT Racing Slip on

 

I JUST SAW THE DYNO CHART AND IT LOOKS GOOD

MORE POWER THROUGHOUT THE ENTRIE REV RANGE BUT NO GIANT INCREASE ON TOP JUST HALF A HP