Back to my comments on the JDM gears and 4.55 R&P... It's great on the street (and cruising on the freeway too), fine for most tracks if they don't have really long straights -- fine at Sears Point, Laguna Seca, Mid-Ohio for example.
If you FI with a lot of HP (adding more than 100) the 4.55 might be too short -- "R" R&P might be better. Plus, I'm told the Comptech 4.55 is not strong enough for high horsepower (fine for me). For occasional track days it is fine (I've done a ton with mine), but for serious track work I'm told they fail.
My $0.02, your mileage may vary.