My friend was the second owner; the first owner had them on his car for 2 months and then switched out the entire exhaust system and sold the Flowmaters to my friend; we installed them on his car and he is in the Navy and was deployed for 8 months, came back and traded the car in so we took the FM's off and put the stockers back on..so time wise they are "old" but they sat on the car while he was gone for a good part of the time.