well i know of someone who is using a greddy E-manage unit ( i think it is called that) to tune his TT system, but other than that i dont think there is much out there as far as ECU options. the only thing right now is the technosquare flash, so im waiting until something better comes out. i know for the honda/acura imports they have something called the hondata and it is a tunable computer management system to your mods.