Throttle body spacer make no performance difference; there may be a small performance gain from the intake, but the flip side is that aftermarket intakes always alter the air flow meter reading (up to 35%!), so that the vehicle needs tuning. Also, short ram intakes often lose power over stock (from the hot air), so cold air intakes are recommended.
Sorry if this is coming over a bit negative - our R18 here runs alot better with the FlashPro, especially if you go from 87 octane to 91 octane fuel.
Okay today we put in the K&N Typhoon intake and I have to say though while there were no great gains power-wise as you indicated it has enhanced every aspect of the way the car performs. I have to eat my words on this one (with my son) because I have only seen these products in the past which made little to no difference at all. We passed on the throttle spacer. If we get the Flashpro can it be used to further enhance these performance gains by tuning? Now It has better mid range, smoother shifting and dramatically smoother idle. If the Flashpro can further dial this in I will certainly go for it. Please let me know your thoughts and whether I can use the same unit with my daughter's 09 SI.