I hear alot of people talking about getting the Sirio but hear nothing after its installed. Is it steady and reliable?.. or fickle like the 2.5? We are junking the 2.5 and need a nice reliable engine, power would be nice but reliability is first and foremost. What about the Megatech M-16? Does it replace the 2.5 as a drop in? Any reviews or advice on the Sirio?