I got a good one for you , one littel turney thing that is a "right angle " and screws on engine , one dirty in bag -extension tube , and one other little turney thing that screws on your muffler at the end of this dirty extension .
All that goodness so that your 4 stroke big cigar muffler exist out the bottom of my ww2 plane and not the side ,
$48 bucks , That 25% of the cost of the engine its bolted on ....lol