We are both right...
" Ben Howard became one of America's premier aircraft designers and competitive pilots during the mid-1930s with a series of models carrying the DGA, or "Darn Good Aircraft," moniker. None was more famous than Mister Mulligan, the racing DGA-6 which captured both the Bendix and Thompson trophies at the 1935 National Air Races."
The plane in the picture is not THE MR MULLIGAN. It was destroyed in a air race crash. It had a 850 hp P&W Hornet engine. The plane in your picture is a DGA dressed up ala Mr. Mulligan? Typically the Howard DGA 11 is considered to be a Mulligan but they only have a P&W R985 engine of 450 hp.
If there is a picture below it is of a DGA dressed up to be like a Mr Mulligan but it only has a Pratt and Whitney R1340 single stage blower 550 hp engine where the original had a 2 stage blower. It's in Springdale Arkansas. It was the second actual replica of Mr Mulligan registered as N273Y. The parts of the original Mr Mulligan, NR273Y, were retrieved from NM and used in a replica of Mr Mulligan but it too crashed some years before the replica in this picture.
Enjoy,
Jim