[gpny]

If it's being built for autocross, and you're looking at spending that much here's some advice... DON'T DO IT!
If you are doing autox and want to race in SM, get a B18C5 or a K20 and increase the compression...
Turbo lag is terrible for autox and with that much power you'll just spin the wheels in the turns.
I speak from experience, I have a 10:1 77MM, 272hp, 240tq Turbo D16 - with a Quaife, and Chris Travis's stock block ITR with custom geared trans is a lot better... Check out my dyno plot in my VBpic gallery for more info.

If you're absolutely dead set on a turbo D for AUTOCROSS, get a gt28R or RS keep it as small as fast spooling as possible...

 

[gpny]

I'm making 50-60 more whp and probably 100ft lbs more torque... When Autcrossing you really only use 2nd gear and need really smoothe power delivery... I'm thinking of getting a 4.5 or 4.7FD to bring the gears closer, BUT I really like the fuel enconomy on the highway right now... Maybe a 2-3-4 gear set...

Chris Travis came 6th at Nationals in SM... bone stock ITR with 2 layer headgasket (or so he claims), custom trans, and 225 hoosiers on 9" rims (front) and I saw him get FTD over GJ Dixon's SS Corvette Z06...