I have a similar design spoiler and I just checked if I can easily do what you did and its solid compared to yours while being an incredibly light piece.
If you want to run 93 only with almost 5 psi more than stock then do that but bitching about those who want an extra layer of octane boosting and knock protection by using e25-30 is childish.
Has anyone of you guys checked your max boost after using JB+? The reason I ask is you could be potentially making too much boost for the stock turbo longevity. I have a piggyback similar to the Jb+ called turbo transformer that has a range from 0-4 psi, and I have to keep it at 1.6-2 psi in...
I came from a boosted 300whp 86 and I wanted to preserve a similar feeling of smallness,agility and tossability but with more power and a finer interior. For me it was either Supra, Alfa 4C or Cayman S and I chose Supra. However I would put the Emira in my list of 4 if it was available.