I talked to my buddy at our Goodyear dealer about them. He had them though they didn't advertise it.
I run 305/40 22's on my Silverado that didn't balance the first time, so I went to beads.
I didn't have much luck with the beads and plan to mechanically balance them again asap!
Originally...
Use the vmax tech & info tab, than scroll down to carburetor and carb tuning.
Airbox mods and filters are tested on a flow bench.
Hope it helps!
http://vmaxoutlaw.com/main.html