Let me start of saying I got my retirement gift a 06 Charger SRT black w/48k miles. I went and picked up my car and the dealer told me it had a Corsa exhaust on the car. Of course I knew that, but I figured it was cat back. So I get there and the owner isn't there and the salesman says did the owner tell you the check engine light is on. I said NO, he said it's the rear o2 sensors, I say OK I'll take care of it. I buy the car after a long test drive since I'm out of state and now just want to go home, plus I think I got a good deal on the car. So I get the car home put it on the lift to change the oil and the first thing I notice is the car has Kooks headers, high flow cats and mid pipes, and Corsa axle back. The car also has Mopar cai. While under the car some of the wires to the o2 sensors were worn down bad so I fixed those. So I figure the check engine light is from the headers and needs a tune. So I buy the Predator and go to load the tune and it stops and doesn't save the oringal tune because it says it already has a predator tune on the car. My question is now that I tried to load a new tune did I mess up the old tune? The check engine light is now gone. I started the car and drove it and it runs great, and it ran real good before but like any motor head I wanted more. Thanks for any help!