Karen Fisher has her own customer base at Big Tit Tune-Up. They leave relaxed and happy. And their cars work too. Karen's gorgeous and her body is smokin'. Her large mams have provided many a happy meal for an auto buff. But Johnny Rod doesn't know who Karen Fisher is. He must be living in a cave. He pushes his dead car to Big Tit Tune-Up expecting a cigar-smoking fat guy. He's surprised to see Karen Fisher and, of course, insults her ability as a mechanic because of her gender. She gets his motor running in an instant, to his astonishment.