A few years back a guy here in Sweden made 416 rwhp at only 1,16 bar with the GIK T28 Supra hybrids they are good for around 1,6-1,8 bar so go figure that was made on pumpgas . This hybrids are similiar to the ones Stu Hagen and Hammerhead are doing in the states now iam sorry but i think Stus the man not Graham when it comes to doing seq. hybrids on Supras Stus been doing it for 5 years now.....
You can read all about it here
http://www.97supraturbo.com/
and FYI a T28R can make 320-340 hp each depending on the wheels you choose i know since i have a setup here that soon will go my R34GTR VspecII :-).
So please stop saying its impossible its not ...nothing is impossible but lots of vendors want to sell there single kits since they do lots of money on them ......
Here are a new idea from Australia this was also said to be impossible to do... i guess the ppl that thoughts so was so very wrong ;-)
http://www.supraforums.com/forum/showthread.php?t=456989