I was under a GTP today in the junkyard and I noticed someone did an Cat delete. While I may never know why they did the cat delete it got me wondering what other mods may have been done and sitting in the junkyard for me to get a deal on. I went for two cars that had been in for three weeks but they looked as if they had been there for three months because of how picked clean they are. Does anyone have any luck with aftermarket parts at the junkyard such as headers, cat back exhaust, K&N products, or real juicy stuff like alternators and transmissions? Are there a lot of people who go through junkyard cars before they get to the yard?