Like people are saying... the GT3076 w/ the larger .82 AR seems to be the way to go for a track car that's going to be running 100 oct. It's not like I'm worried about autocrossing the car, and at the track, I'm between 4000 and redline in gears 3-4-5 pretty much exclusively with the 6MT.
The GT52 though does seem to be a damn nice turbo if you're not willing to go rotated... especially if you're running alky injection, or if you're streeting/autocrossing the car... in fact it's probably better than the GT30's handsdown if you're not building the car specifically for the track.
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