I just read an article about different apps (cant remember if dynolicious was one of them). But anyways compared to real devices meant for that, the iphone doesnt really that accurate of a job. It might be good enough to give a general idea, but shouldnt be taken too seriosly from what I read about them. But again this is just from reading a decently wrote article. I personally havent even driven my car in 5 months so...
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX