Hi bud,
It's worth noting that SaqTRD's car is a BPU auto so he has the benefit of the 1st turbo to help get off the line, where as you're single turbo you won't have that boost punch of the first turbo to help aid acceleration. Don't get me wrong the hi stall helps acceleration a lot on the single turbo as I said, but it can be a pain to use on the street if you are not used to it. A 50bhp shot of NOS may help with acceleration but it's a lot of hassle to fit if you won't be using it often. Maybe see if you can pick up a second hand hi stall or try a passenger ride so you get the gist of it. In regards to MT street radials, you ideally want a 15/16" rim that can be used with the stock j-spec rear calipers. The stock 16" supra rims work well as I mentioned to you .