You will like the shorter final gear. My Silvia has a 4.1 gear which is standard for 5sp JDM models. I've since spent some time in UK spec 200sx with 3.7 gear and the acceleration is notably duller. Most people swap to the 3.9 auto diffs but I don't know why when the 4.1 isn't stupid at all.
Yeah looking forward to it as the stock 3.62 final ratio makes the gears too long, did want a 4.10 but at half the price the 3.91 will do.
