Hmm... dont know. It was just the Bisson muffler I had the LHS get for me. The pipes shoot down and a little towards the back. I didn't use flex, but i did add an inch to them by putting on that blue exhaust tubing. Using that tubing, all the exhaust evacuates the cowl and is out in the airstream. The airplane is usually pretty "goo-free" at the end of the day.

Here's a pic of the slimline muffler I had on the 1.8 at one time. It got replaced by a new Bisson. The slimline and the bisson were configured almost exactly the same.


Other pics are at http://www.devino.org/mark/airplanepics/edge540t.htm