I am here and sorry to hear about your car!
As of now, I believe the highest horsepower Evo X MR is 330 torque and any higher the tranny will start slipping. That car runs mid 12 on the drag strip, so it is pretty impressive nonetheless. Like Verkion already stated, Xtremeboost is in the process of obtaining a spare SST transmission to develop a clutch packet that can handle in excessive of 500 torque. Another thing is that SST does not suck, I wouldn't compare the driving experience of the SST with manual, because they provide 2 completely different driving experience, just because it doesn't have a third pedal doesn't mean it sucks. I remember from reading a car mag, the one of the author says that it is even better than the DSG in the GTR.
The Evo X MR at AJ has turbo back exhaust, AEM air intake and T1R intcooler pipes. From what I hear, its doing fine. When spring comes, T1R will start working on Cobbs Access port map with Rally Rocket, so that will be a huge advantage to local Evo X owners who are looking for a tune. They will provide separate maps for the GSR as well as the MR.
One of the local MR owner recently got a tune at rally rocket I believe, the base line was 200 awhp and 210 torque, after a conservative tune they saw a improvement of around 50 torque and 50 awhp. The baseline seems low, however, the dyno they run on, I believe its Mustang Dyno. Here are the graphs...
Baseline, no tune: 200whp/210wtq
2nd run: Cobb stage 1 (91 octane map) 235whp/226wtq (+45whp & +35wtq gain at 7100rpm)
3rd run: Cobb stage 1 (93 octane map) 245whp/233wtq (+55whp & +45wtq gain at 7100rpm)
Boost & A/F ratio graph for all 3 runs:
A/F for baseline spikes to 10.7 falling to 10.4 at redline.
A/F for 91 octane map spikes to 11.4 falling to 10.7 at redline.
A/F for 93 octane map spikes to 12.4 falling to 10.7 at redline.
His mods only consists of Gruppe M Intake/ARC intercooler + pipings/Cobb AP...