I ran Cobb stage 2 without a problem, I don't really launch the car but I do enjoy driving the car hard on occasion. My current setup is a 16g, sti tmic, walbro, gm ebcs, catless dp, sti cbe which dynoed at 257hp/290tq on a Dyno Dynamics dyno. I really like the power and have not had a problem with the transmission. I personally feel stage 2 is not a problem for the transmission unless you launch or slam the gears around. I bought an accessport right when I got my Wrx, stage 1 did not really make much of a power difference on my car but I enjoyed all the features on the accessport. The only thing I really regret about the accessport is paying $595 for a new one, I later found out used ones could be had for around $400. I don't really want any aftermarket gauges on my car which makes the accessport great to monitor boost, afr, etc.