well think of it this way, the 2004 2005 STi had 4.6 gears and they're turbo. They also have awd so they will hook up a lot better. I would think 4.08 would be fine but if you're going turbo the stock 3.7 or a little higher 3.9 is what I would go with. Especially if you're doing 500+whp. On the other hand the 370z has a very linear power curve so 4.08 might be just fine ! What would also help put that power down with the higher gearing is a better LSD ! haha
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