Thanks John,
Here what I am trying to find out. I am about to pick up a 99 SC400 with the VVTI.
I have heard that the VVTI does not respond as good to changes like A/F adjustment and Timming advances. I am a little torn between the Unichip and the SMT or any other that works. Wondering if any one N/A motor has run any of theses on the VVTI with luck.