I have the OS 160 twin in mine. and it is the perfect match for this airplane, IMO. The engine fits nicely in the cowl. it has more than enough power, and it runs like a clock. And its true, the sound is fantastic. When the plane is on final with the engine ticking over, its as realistic as it gets. You can hear the engine mechanical clicking, prop noise, and the air whoosing over the wings and struts all separately. Its a great combo