just what i was tryin to make , until my cossie came along and used all me cash up , moveing very slowly , just about to order a manifold from these guys
all in usa sorry
http://www.turbochargingdynamics.com/tcd_catal.htm.
here are some dyno figures useing these kits
m20b25 S1 at 9psi = 235rwhp
m20b25 S2 at 13psi = 285rwhp
m20b25 S2 at 16psi = 320rwhp
m20b25 with standalone and 16psi = 345rwhp or better
these guys do cheap converters for standard manifold
http://www.666fabrication.com/
good luck with the project