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 flagged and had to go to a state station. The first thing the guy said was, “Is it tuned”.
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 your 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 issuing 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. I only had it happen to me once when I had to go to another shop because my mechanic’s machine was down. They said my truck was awful loud and checked to see if I had cats and a muffler. Little did they know, the cats were punched out. How long ago did you work at a station?