I don’t know, why would someone needing to get the most that he can as a trade-in try to tell the dealer it was missing an important part?To be fair, maybe the previous owner just told him that. He's not going to go disassemble anything to look if the performance PCM was, in fact, removed.
This is TRUTH. They know one thing. SELLING. Most don't know squat about the car they are selling, besides what the former owner told himDon’t ever think that a car salesman knows anything about performance modifications or even much about cars in general.