Ask around to find out if others with a da have had to add weight to the nose. If you need weight it might as well be in the form of a more powerful engine. My composite arf witha da-50 was going to need weight in the nose. Instead I added a 3w75 and bingo perfect. Tons of power and others with the same plane like the performance of mine with a 3w75 over thiers with a da-50 and pipe.