You do the math: unported 906s flow max of 228cfm. Sidewinders are at least 270. 1cfm can make 2hp. 40# weight loss to boot. Todd Marsh is supposed to be selling them ready to go.
But since the Sidewinders came out Trick Flow has dropped a new head into the market and that flows maybe 330 out of the box. I can't remember, but there are a lot of posts here about both sets of heads.
