Happened to me a couple months ago I was shocked someone would steel my cat.. figure someone needed it for their car since you cant pick it up at the junk yard.. come to find out theres alot of valuble metal in there.. I was working on my starter and looked up when I was underneith the truck and thought to my self whats missing lol .. than said woooooooowwwwww someone got me for my cat.. shocked, surprised, stunned, like damn.. but I like the insurance idea Bad Vision talked about.. ive seen 3 different types of cat locks and catchers online but there almost the same price as an alarm.. just pick up an alarm.. the new cats they make to replace the old ones dont have all the valuble metals in them like the stock ones so I doubt they would steel it after you have already replaced it.. I got mine for $67 beats paying $130 at the local auto parts store..