Flew down around noon from KCCR (Concord) to KHWD (Hayward) for maintenance on the plane. Beautaful smooth flight, a bit warm, as it was 93 F. Worked until about 5:30 pm and then flew back. My twin (mechanic Brian) went over the plane with a fine tooth comb and found several things which needed fixing. One, the exhaust pipes were put on backwards (Left vs Right) so the tubes pointed back instead of foreard. We’re going to complete some radio upgrades and other minor cosmetics. It was a great day!