opinions on FMF q/q2

[ATC350X 85]

I am planning on buying a 400ex to build into a 426 w/ a stage 2 cam etc. I need to keep the noise level down where i ride. What is everyones opinion of the fmf q or q2 pipes for a 400ex?

[BlasterEaten250]

my uncle has a Q2 on his kfx400, he used to have a titanium 4. It it A Lot quieter, but also doesnt sound as good. Not as deep of a tone, more high pitched. He said that he lost a little power when he switched to the Q2. Very quiet though.