is socaleuro a car show? never been.
the secret behind holding all this power has been lots of crossed fingers, two torque converters and very few launches. right now i'm running on a stock tune. i'm looking at hitting the same hp figures you want. a torque converter and valve body recalibration is gonna be necessary. these tip trannys really dont like added hp. now you gotta understand the tranny upgrades youre doing arent gonna solve the issue, just bandaid it. there are very few people running stage 3 cars with healthy auto transmissions, upgraded or not. we both might have to even go as far as fully built transmissions to handle 500whp.
this is the only place you should let touch your tranny:
517 Trans - Catalog - Audi
about the sways, the way the h&r's are designed put unwanted stress on the rear sub-frame causing it to break. eibach, neuspeed and hotchkis have all fixed this issue.
i hear good things about the franks. just wait a little while and see how they do once people who have bought them get some miles on them under high psi. this same thing happened a couple years ago with RP turbos. they were dirt cheap and all the right companies were selling them. within a couple weeks of everybody jumping on the band wagon there were dozens of people with oil spewing turbos. bad actuators and complete garbage all around. nobody got refunds.