An STi 6 speed can easily hold double what the stock STi puts down. I think it will be perfect for you. With a controller like Sperry uses, you can adjust the torque split too. Here's what
Andrewtech charges to rebuild gears 1-4 of a WRX 5 speed:
Quote:
1-4 syncro set (helical or straightcut) $3500
1-2 & 3-4 billet forks $650
Install parts (nuts, gasket, seal, springs) $100
Should do syncro's, we sell them as a kit for $250
Labor to build the loose unit $650
These are everyday prices here.
Andrew Yates.
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If you drag, the stock 6 speed ratios aren't the best. so you may want to consider the 5 speed. You can choose what ratios you want.
I know you said you want an automatic, but I can't help you there.
I use an Odyssey battery. You can mount it upside down in a sealed container if you want, it works in Reno winters, and it's about $100 shipped with posts. Lots of Suby owners are using them and no failures have been seen yet.