I just finished my "Corvette" (Old School) sport pattern plane 72" wingspan with an OS .61FX with a Mac Pretuned Pipe on the business end. My question is, the pipe did not come with a presure fitting or anywhere on the pipe indicating where it might go. could someone tell me where would be the best place to put it and since the wall is so thin, how to secure it. Also, I'm goings to use the presure fitting off of the stock muffler and I need to know what size to drill the hole and the tap size.