I don't have one but I've seen a few people say not to expect any gains from it. I've also seen posts of people saying the ecu corrects itself when you add mods to the engine, so until flashpro comes out, don't expect much gain from anything. Maybe someone who has tried one can give you some better insight though.
According to their website, flashpro is only available up to 2010 for the r18. If they didn't include the 2011, something must be different so I wouldn't count on it. I also emailed them to see if plans were made for the 9th gen non si's and they said no. That being the case, if it would work, I'm sure they would have referred me to flashpro for the 8th gens but they didn't. So for now, I think we're sol.
TBS just makes your car breath smoother, I have it on my Si and haven't noticed any gains besides maybe 1 mile per gallon and I've been driving the same as always.
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