You are going to have to cut the cowl for clearance anyway, so I think it would be your choice. I'm still breaking in the OS 95 FS, so I really can't give much info on the equivilant power. At the moment, I'm not impressed with the power on the top end. The DLE will cost a lot less than the OS. I'm not sure how far the prop hub will be forward of the cowl. I think Desertlakesflying has flown with the 15cc and then went to the DLE so he could probably give better info on this. Good luck.