SII transmission ability to handle more power?

I've got a 2010 Sport MT and am looking at putting in a different engine with greatly increased HP and torque. I'm aiming for around 525hp with about 475 ft-lbs. It would be easiest to use the existing transmission and just run an adapter plate, but I have no idea if that kind of power would make the trans unreliable - or just blow it clean up.

Anybody have any kind of experience running that trans at higher power, or doing mods to improve it's power handling?

I have the same question of the differential, which would be harder to swap out..

Thanks.

SII transmission ability to handle more power?