ORIGINAL: downunder
There's still arguments raging about whether the Dooling 29 originally came with a RH exhaust or LH (it can be assembled either way).
I have a three view and parts list (PDF file) that shows a Dooling .29 with exhaust on the right side.
My Dooling .29 is in parts, in a box, though.
UKIE,
On the K&B, before mufflers were used, it was nice when flying at dusk to see the warm glow (on an upright installation).
You mount them just like any other engine.
George