I've been wondering about this too. My DD has an Ma5 and has had at least 1000 hard launches @ 190rwhp in a 3800lb truck. But i wonder how well it would stand up to a torquey V8. The I5 is far from torquey.
From what I've read they apparently do LS1 conversions into Soltice's so I feel like that should speak to the strength of the MA5 trans. Not to mention that it originates from the Toyota R154 that is supposed to be a more than capable high performance transmission that drifters beat on constantly.
Interestingly enough, wikipedia lists the curb weight of the Solstice at 2877 lbs. Not far from what my '66 Dart probably weighed based on the NHRA listings. So, 5.7 hemi in my car is lighter than the old small block by a bit, LS1 is significantly heavier than the 4 cylinder they put in the Solstice... I feel pretty good about it.
