Was the happy owner of a 2010 GT500 until I went to the state inspection station get a sticker. The car has been mildly modded with long tube headers, pulleys, cat delete xpipe, and a tune via SCT X3 tuner. The inspection station has rejected me due to the emissions test. It originally failed because the emissions subsystem (catalyst and 02sensors) was in a "not ready" state. I drove the car 100 miles or so, and tried again. Still not ready. After further investigation the rear 02 sensors were disconnected. I bought harness extenders and connected the sensors and it's now failing on codes P133 and P2196 which are "pending". The previous owner is suggesting that I spend money on installing cats and then flashing the computer back to the stock tune to help pass emissions. The big issues is that the stock tune isn't very driveable considering the mods and there is risk that I could hurt the engine. I also don't know how long I would need to drive until the computer will allow the car to be inspected. Any advice is appreciated. The car was from Penn, and I live in Mass where our emissions standards are strict - second to only California. The inspection station is forgiving but tricking the state emissions computer is difficult.