I'm curious now as to how acurate the scan tool is versus a timing light.

I went out for another run and filled up the tank with scan tool in hand. After warming up I did a couple downshifts from a cruising 4th gear to a quick shift to 3rd, and what I got was; at cruise I run -34 degrees with a steady throttle, then as soon as I downshift and go WOT the scanner jumps up to -12 or sometimes -18 degrees.

Now I know the obd2 port is slow at feeding information packets to the scanner, but there is no way I'm getting zero degrees or anything close to it.

I will also be doing the whole front grill mod as my IAT is pretty high for 75mph.
I get 100-105 F intake temp, while outside air is 72 F. I'm definatly gonna have to buy a Cold intake after those readings, as that is quite the change in Temp.