good evening,

i'm seeing/needing a pitts style exhaust for a magnum .91 on the slimline site. lots of folks say there are many similarities between the two vendors and that some parts are interchangable. as it appears, the site doesn't offer a pitts type for the magnum specifically.
my question is; is the os-91 exhaust port angle the same as the magnum-91, likewise the port i.d.? so that the muffler will sit flush underneath. also, i see that saito's .91 has a diff part number for the pitts muffler on the slimline site.
any help here would be appreciated,,