i don't know how exactly the tuning works on the speed yet. but my understanding is it is pulling boost (or throttle as it were) after roughly 5500. now if this is in the tuning, it seems that it's set at a rough rpm rather than a temp, unless everyone's car hits a certain temp at the same rpm. i think someone like P5Freak would see more gains as he's running the boost controller, but for someone that has a bone stock car, i don't see 20hp to the wheels without any tuning. i've spent a lot of time on the subi and mitsu forums looking in the past year, and it just makes no sense to see those gains? even when looking at cars with shitty TMIC's (like the mini) i haven't seen any gains remotely close to substantial prior to tuning.
Now as i said before, i think in most cases, that buttdyno is more FUN than anything you can see on a dyno sheet. if YOU feel it, that's what matters, that's why i still tell people do remove the balance shaft. but i don't feel bad if it doesn't show up on a dyno, cause you can feel it for sure.
the hard thing is also, just like believing there is a turbo kit for the 3.0, is no one will believe anything until there is a dyno (and in most cases with A/F on it to make sure it's safe). just because a Gtech says you gained 50hp doesn't mean it can be shown to the masses and they can see how it will benefit them. it's seems like most are believers here except for a few skeptics, so you never know.