This week on The Best of Car Talk, Jim replaced a torn CV joint on one side of his Subaru and then decided to replace the other side, just so it wouldn’t feel left out. Now, Jim’s car is “undulating” on the highway. Is Jim’s good deed going punished? Elsewhere, Carla can’t figure out which of her brothers she shouldn’t drive like, when it comes to shifting; Ainsley’s bumper is being held on with epoxy and her husband won’t let her take it through the car wash, fearing the bumper will be left behind; UPS driver Steve wonders why his colleagues all get new trucks and he’s still driving a beater; and does Scott have a French horn player living under the hood of his Explorer? All this and more, this week on The Best of Car Talk.