What exactly does VA test for during an emissions test? Over here in Cali we test for NOx, CO, HC, O2 and CO2. Excessive smoke doesn't apply to smog checks here.
No pics but I think silver rims will keep your car looking clean. Personally I think the other stuff will look too tacky on a Lexus...but that's just me.
10 minutes is for your idle to go from high all the way down to 650 is normal isn't it? I wouldn't suggest letting your car sit there for 10 minutes idling every single time though. Just do what barkat suggested and swap out your thermostat.
That's pretty much normal for you car to take 10 minutes to warm up on a cold start. Letting your car idle for 10 minutes isn't good for catalytic converters though.
The antenna wire on the aftermarket HU is for the power antenna to go up or down. If you don't have a power antenna then you don't have to worry about that wire and you can either remove it from the harness or just tape it off.