The main changes are to the ECM and other engine control components. I know that the MAF is changed so short-ram/CAI intakes won't work on the '07 unless it specifies that it is for 2007. The ECM has different pinouts for the Crank angle sensor, Bank1/Sensor1 (wideband), and Bank1/Sensor2 (narrow O2) just to name a few. This also makes issue with the install of the TRD S/C a redesign. I believe the auto has some electronic changes too. I have not heard of a compression ratio change on the 2AZ-FE.
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