I used that engine in an PL Smaragd for about 4 years, standard O.S. pipe and header. All I can say is I love that engine. 100% reliabe and trouble free. The only thing that happened to me was that I had to change the front bearings after 40 flights, only the first time, then they last for about 200 flights. Be carefull with you airplane weight. Less than 4500 grams its OK, more than that you will have difficulties in the top of the manouvers.