Well my car isn't a low 13 second car yet.. well it might be if I was a better driver.... people hit 13.2's and 13.3's with my mods.
I have more than a couple grand invested into my car but a lot of that isn't necessary if you just wanna go 13's in the 1/4.
The legacy GT from what i've heard are making a ton of power even with just a flash. Basically the STi motor with a smaller turbo...not sure what they run in the 1/4.