You can look on these sites & see...
http://www.hahnracecraft.com/auto/index.htm or
http://www.dsmtuners.com. I have know
people to push around 300-325hp on stock internals, but never 400. Its really hard to say, but if he did then alot of people who build eclipe engines are going to ask how he did it! Hell Id like to know myself as well...Im running a Hahn's stage 2 turbo kit with stock internals, msd ignition, cam gears, 55mm throttle body & at 10psi Im pushing right at 300hp. So get him to pass the info on!