Hey, diamond. I've not experienced the mirror darkening too much" thing, but I have noticed that it darkens when I'm on a bright street, with a lot of street lights. It doesn't create a problem, I just thought it was a little too dark.
Regarding the injectors, that is definitely the direct injection. I run an auto repair shop and when the direct injection came out on other models, everyone used to bring their cars in with a "valve lifter" noise...Problem is, THERE ARE NO VALVE LIFTERS.
The injectors tick, you'll have to get used to it. BUt hey, with 306 hp and low emissions, who can complain???