Did you even go visit the links? The i-club link had several WRX owners arguing over a 13.3 ET bone stock, and a 13.1 with mods. The only dude there claiming 12s (about the modded STi) thought that a "better reaction time" would give him a better ET. The other two links had bone stock STis at 13.36 and 13.2. Where are you getting this mythical 12.9?