I don't have the time for a lengthy post like above, but Bren tuned my 2006 STi way back when. The current owner of the car hasn't changed a thing.
It was a Stage II tune, done when Bren was still doing road tunes (I feel like this is amateur hour). I was fine with an Intake, TBE, and BOV - Bren convinced me to go get a Forge Unos MBC and a Walbro prior to tuning, which would maximize the performance I'd get out of the tune.
Car ran great!!! the Rev Limiter piece of the tune was a blast to play with when scaring Civics, and I honestly didn't try the flat foot shifting piece - just wasn't for me.
The car definitely pulled hard, and I was