Thanks, everyone. Super helpful.
I'm curious about air suspension, does it affect the ride in any way (vs standard suspension), and if so how?
I went back and forth on this and was initially going to skip air suspension because a mechanic talked about reliability issues with the air suspensions from other car manufacturers. But, long story short is that it may improve ride quality in a minor way vs. stock springs and gas shocks, but not anywhere near as much as switching from 21's to 19's with stock profile and width wheels/tires.