My wife doesn't know much about cars, or performance parts, but she does like cars, even though she gets a little anxious when I do a burnout or drift, she has always been supportive of my addiction, going to the drag strip with me, usually taking pictures and video. She used to marvel at how I would know what year, make and model of a car she would see on the road or at a show was, typically asking me "how do you know this stuff?" Been a car nut all my life. She used to help her dad when she was young, he was a bit of a car guy too, though I never knew him.
