I dont know if anyone has read this yet, so I figured I would post it. Has some really useful info on it. Pretty thorough.
ftp://ftp.americansportbike.com/outg...est_Report.zip
Its an Adobe Acrobat file, so it takes a while to download. Be patient, its worth it.
I've had that for a whle. It is an amazingly thorough test of just about all the available aftermarket pipes. Very impressive.