Ed in PA needs help choosing an engine for the airplane he's building in his garage. Do Tom and Ray have enough liability insurance to give him an answer? Also, guilt-racked Cindy worries that she killed her engine driving in a post-carbon monoxide poisoning haze, Sarah in Boston would like her car to be less hospitable to thieves, and less of a target for delivery trucks, and is a trip to the Giggle Hut as healthy as a trip to the gym?