2000 NA RS

[b-man1]

Hey guys, I was just wondering, can I use a tactrix 2.0 cable and ECUflash to tune my 2000 2.5RS? I plugged one in the other day and it did give me readings such as intake pressure, engine speed, load, and what not, but we did not test for tunability, anyone know if it'll work?
I'm running 5psi on the NA motor and am looking for a better fueling curve.
Thanks for your help