Thunderstruck1212

Well this one doesn't have a supercharger. Looks to have an aftermarket cold air intake. That's what made me wonder if it was legit or not. Maybe they didn't put a supercharger in some? Idk. Very clean truck though. Leather heated seats 160k miles, so I'll probably end up trading him. Just didn't know if maybe it would tell in the vin or not

I've got a guy wanting to trade with me and he has a 2006 Silverado thunder edition. Can somebody tell me what makes a thunder a thunder? What should I look for to know if it's a thunder or not?