
I can't read Japanese (I'm assuming that's what it is) but are they talking about a car that's NA, or one that's FI? There is a video online of boosted car picking up 10+whp. While it is a gain, 10whp on a 300whp isn't very much (~3%) and that car has full bolt-ons, running E72. I haven't seen NA one...yet.
I'm not trying to be hater or anything, I'm just trying to be realistic. I could see it being a good part for someone who is a diehard NA fan who plans on doing valve train work, port polished heads etc. For more 86 owners (and price), an OFT would be more beneficial.