Best Headpipe?

I AM THINKING OF GOING WITH A FMF POWERBONG OR A XR'S ONLY HEADPIPE TO GO WITH MY WHITE BROS E SERIES SLIP ON. WILL I SEE A DIFFERANCE ON MY 12.5 CAMMED AND PORTED 400?
WHICH ONE DO YALL THINK?:devil

[max400EX]

I say give the XR's only a try. It looks like a solid piece of work. I havent seen anyone with it tho, they dont advertise alot. Who knows, that might be the next "fad"