I've brought a Stihl MS170 for camping/firewood etc. It is only a little saw but good for what I need it to do. only $299 at the moment and you get a free esky.
I fitted a LRA 150ltr tank to my D40 last week and had no issue with my Roo systems 3" exhaust, there is a good 2-3" gap between the heat shield and the pipe