John, the differences in Kostas' setup will be the following
VWR intake (From stock)
Q45 throttle body (From stock)
Different ignition setup (From stock)
Fuel injectors
Map sensor
And mapping instead of 1.8 bars@11 afrs, 2+ bars@12 afrs. The mapping of course includes a completely different ignition and fuel map, it's not just adjusting the fuel. The whole ignition approach is totally different.
As far as the egts go, would you think that I would give a customer something that I haven't tested. Nope. I usually dip the tongue in my brain before I talk, and the power difference will be more than 100hp, a lot more. Also there are some minor changes on the oiling system that help some components to run faster thus producing a lot more power. Let's just say there is a lot of hidden power in some things, that we learned from tuning a lot of 4g63s, vr38s and a lot of tfsi's and 20vt's. We have really experimented for the last year in a lot of different areas, even risked a lot of good engines trying different approaches, and applying late generation technology on enough areas of the 2jz. Cheers.
P.S. but believe me if the thing holds at top speed runs, it will hold at a lot of quarter mile runs. Also when you it's about 2.5-3 bars, then there is really no point in running 11s and pump gas, since any logical tuner would run c16 and lean it to 12.6-12.9 and add about 6-7 degrees of timing everywhere.