Need new upgraded Ls tranny.

Ok hi, My freind has a 92 integra and he just killed his tranny killed the diff and synchro’s are gone. I was wondering is there any places that he can buy a built Ls tranny from Ex: Upgraded diff and double synchro’s in second maybe third. He took his tranny to a tranny shop and they want 1600 to rebuild his tranny with all stock parts. Plus they didnt even no if he could double his synchro’s and told him its going to be alot more for that. He’s planning on building his motor and turboing it. So he wants a tranny that can hold up to the abuse. Anybody no a place that sells a good “race tranny” or something that will holdup to like 300-350hp. Ex. www.teamrip.com this is place for eclipse trannies but he’s looking for a place that can do this type of stuff to his ls tranny. Thanks

Anybody??? if he just gets his tranny rebuilt with the stock parts and all the synchro’s replaced then just put a quaife lsd u think it could support about 300-350hp? thanks