PWM radiator fan controller

[parsonsj]

For fun, I downloaded a ZR1 tune for MY 2011 with some mods, including the same injectors I'm running.

It has a bunch of segments my GMPP tune doesn't have. What I don't know, and what I wish I could get some guidance on, is how different the ZR1 tune is from the LS9 GMPP. I know that the GMPP tune doesn't have after-cat O2 sensors. Is there anything else?



I guess my concern is that by getting support for the pwm fans in a later OEM passenger car tune, will I end up with a bunch of other stuff that will cause me more trouble down the road?

Another question: how do I deal with the VIN number?