Don't you have an SVT exhaust on your car as well...you could get $100-$200 for it?
My car had a bad knock a year and 1/2 ago...I drove it around for about a month

It was still under warranty so I didn't really car if the motor went up or not...plus they couldn't get me in for a couple of weeks. They replaced my bottom end...so far so good "knock on wood"
Scott