6boost manifolds are turbo manifolds that are produced in Australia. Best quality I have seen by far! They use merge collectors (designed by Kyle - owner of 6boost) that reduce turbulence where exhaust gases enter the turbo. I quote this thread from performanceforums.com :
Also, a dyno graph of manifold for above SR20 manifold. Engine is an SR20 in S15 200sx from mercury motorsport. Before power was 410rwhp with previous stainless manifold, boost controller fitted, 700hp garrett turbo, cams, internals, head work etc, boost drops from 29psi to 27.5psi at peak power.
After power is with 6boost.com turbo manifold, with my "merge collectors", 36mm ID pipe, no boost controller, same turbo, internals and cams, becuase of teh lack of boost control, the boost creeps away from the wastegate spring pressure of 17psi, to 23.5psi. New peak power is 441rwhp, a gain of 30rwhp on 4psi less boost. Draw a line in the power vertically the same distance the extra psi makes when coming on would make, and you get the picture, also note that at 4500rpm, it makes 5psi more boost and almost 60rwhp more than previous, and still with no boost controller, expected power when tuned back to the same 28-29psi is around 500rwhp on pulp.
Cheers.....................6BOOST
Here's the link: http://www.performanceforums.com/forums/showthread.php?t=67194195
The guys website is not running yet unfortunately but there are a few threads if you google it.