How about this idea...
Performance & Perfection: Miracle Mod
I'm skeptical... the "dyno" graph displays a HP/Trq. gain of maybe 1 to 3 points, which is also within the + or - range of a typical Dynamometer run. Also note that there is almost zip improvement until you hit the uber-high RPM's, hopelessly impractical for the savvy Street Rider.
As a "do-it-yerself" project, maybe its worth it with some sticky-back "Dynashield" foil insulation, but I'd be hesitant to spend $150.00 for this from these guys.
I'm always all for gaining that tiny extra fraction of torque and efficiency, so maybe it's worth a try.
Any thoughts?
Bob