MA LEV Program
I stand there and watch my mechanic take pictures with a point-N-shoot digital camera every time I go for a sticker!
Yes, they can fail your vehicle if the windows are tinted more than 35%!
Tires are not allowed to protrude from the outer most fender wall unless it's a 4WD. Not positive but I think it's no more than 2"
Key word on the tunes is "anymore". I'm talking about my 2007 going back about 12-15 years when I was failed and had to go to a state station.
Same with the EGR. My 2007 has EGR.
As for the cat's, if your exhaust is loud, they can check for cat's. If they pass your vehicle and then you get stopped the next day because a cop thinks you exhaust is too loud and they pull out the mirror an see there are no cats, you're getting fined and they will go after the station issueing the sticker. I've seen it happen more than once! Lot's of guys used to keep their OEM exhaust just to switch it back when going in for an inspection.
Why you don't know these things haveing been a state inspector, I don't know.