ok, had my 08 mustang gt sitting for 2 1/2 weeks at my mechanics shop while my vortech v3 strim head unit was getting new bearings and seals put in it. I had very annoying sound coming from head unit, I was told yeah probably a bearing issue, so I shipped it to vortech. mech called me said ok, she's ready, I picked it up next day I noticed insp sticker was out, long story short it wont pass the "readiness" part, like two o2 sensers heat and catylist, everyone said put about 50 to 100 miles on it take it back and she'll be good to pass. NOT ! I now have about 370 miles on it since I picked it up. been to the insption 3x it wont pass. PLEASE ive tried removing the pos cable from battery then drove out to the country to drive it in all conditions still wont pass, what can I do, help,, im at a panic. thnx oh, by the way,that bad/annoying irritating noise still there, but that isn't important at this moment, passing inspection is. : (

 

I'm in the DFW area for work and had to have a new alternator put in a few weeks ago, on a tip from the local mustang clug, I took it to the Gearheads shop in Arlington. They did a fantastic job and went above and beyond to take care of me. They stopped what they were doing and got me back in working order in just a few hours, plus the price was way under what anyone else wanted. Hope you get it fixed.

http://gearheadsperformance.com/ghj/

 

The problem is probably in your tune. The rear sensors may still be turned off.