[8695Beaters]

If you can't find any small shops, go find a dealer. Some will work on a modded car, some won't. I don't know trans codes, but if this transmission came with the B16 you put in, it's best to leave it. The ratios were designed for that engine and powerband, so there's no sense in screwing with it. As for the short shift kit, personally I think there are better ways to spend performance money, but you should be able to install it yourself. You only need a few basic hand tools and an hour or so. All a short-shift kit does is change the shifter arm geometry so that the throws are shorter. The only performance gain is that it takes slightly less time to shift gears. An engine/suspension part will give you gains everywhere, not just on the shifts.