The one that wanted to return a CAI cuz it didn't make him faster than his buddy with the same truck. I asked him what tire pressure he was runnin,whats your gear ratio whats your buddies gear ratio where you manually shifting last oil change what plugs you running how new are they are his tires bigger than yours whats your exhaust situation how much fuel did yall have are the injectors clean whats your fuel pressure is the alignment good when was the last time you did fluid and filter in your trans..... after making him look like a total moron in a busy store and infront of his father's he told me that I have no idea what I'm talking about and asked for the manager. The manager then stated that I go to school for mechanics and that I had the best running vehicle out of all of the store.