I have a Stearman with a DLE 30.
It really helps with the balance. Cowling needs some cutting to fit the stock muffler. There is a muffler out that moves the can to the rear of the engine if holes in the cowl bother you.
Impressive power, use full throttle for verticals and times of trouble, otherwise 1/4-1/2 throttle cruising is a piece of cake.