So the warranty is up. I decided to start the "non-dealer friendly" mods and ordered an SCT Xcal from Brenspeed. I'll admit I don't know much about them as I've never used one or known anyone that has one. So I've been doing some reading about them. I see that they offer a data logging function, and they can read A/F ratio using a wideband O2 sensor. Has anyone added a wideband O2 to their car? What parts do you need to set it up with an SCT? I assume just a sensor and the wiring? By the way, I have no desire what so ever to alter the tune that I will get from brenspeed. But datalogging with the A/F ratio would be nice. Especially if it isn't to expensive to set up. The price of wideband O2 sensors has dropped to $50-$75 which is quite reasonable.