Nice pic of one of Adelaide Biplanes' Sport Cubs on Airliners.net:

http://www.airliners.net/photo/(Adel...Cub/1912916/L/

Interesting exhaust installation. This same airplane had the stock S1 exhaust in this 2008 photo: http://www.airliners.net/photo/Untit...Cub/1342926/L/