the Supermunk (stick a proper Lycoming into your Chippie)
Mary, to paraphrase Crocodile Dundee: "That's not a Supermunk, THIS is a Supermunk!"
Art Scholl's much modified Chipmunk. I was able to have a close-up look at N13Y at Springbank (CYBW) in the 70s, when Art was performing daily aerobatics at the Calgary Stampede grandstand show - both the afternoon and the night time show!
Lycoming GO-435 260 hp, retractable gear, clipped wing with full-span ailerons, larger fin and rudder and a single cockpit. A very impressive aircraft, but in my opinion, it was no longer a Chipmunk.