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There are two different aspects to replacement gears: the short gears and the R&P. The primary benefit of the short gears is just after the 1-->2 upshift, in the 40-60 mph range; the downside is that, in closing the gap between first and second gear, it opens the gaps between second and fifth. If you're most concerned with track performance, you're probably better off with the stock gears over the short gears, since you're typically spending time in the speed range 60-140 mph (depending on the track) where the stock gears are generally superior to the short gears.The R&P won't have much effect overall on track performance. It will be better on some tracks, worse on others. It will have the effect of reducing all your shift points (speeds at which you upshift) by roughly 11 percent. It may put you in a higher gear in some stretches - into third where you were in the upper part of second with the stock R&P, and into fourth where you were in the upper part of third. There may be tracks where you do a lot of shifting with the stock R&P and less with the 4.55; there may be others where it is the reverse.Overall, neither mod will do all that much for you if you drive a variety of road course tracks.Of course, they will give you the perception that you are accelerating faster, because you will reach redline sooner - but at a lower road speed.
There are two different aspects to replacement gears: the short gears and the R&P. The primary benefit of the short gears is just after the 1-->2 upshift, in the 40-60 mph range; the downside is that, in closing the gap between first and second gear, it opens the gaps between second and fifth. If you're most concerned with track performance, you're probably better off with the stock gears over the short gears, since you're typically spending time in the speed range 60-140 mph (depending on the track) where the stock gears are generally superior to the short gears.
The R&P won't have much effect overall on track performance. It will be better on some tracks, worse on others. It will have the effect of reducing all your shift points (speeds at which you upshift) by roughly 11 percent. It may put you in a higher gear in some stretches - into third where you were in the upper part of second with the stock R&P, and into fourth where you were in the upper part of third. There may be tracks where you do a lot of shifting with the stock R&P and less with the 4.55; there may be others where it is the reverse.
Overall, neither mod will do all that much for you if you drive a variety of road course tracks.
Of course, they will give you the perception that you are accelerating faster, because you will reach redline sooner - but at a lower road speed.
