Hi Ren?,
I ended up ordering a custom, 60 degree heat muff from Rick Robbins at Robbins Wings. I used the same end caps and tie rods, so just the muff was $45 including shipping. It should really be the standard issue for forward facing sumps. The only option with the standard muff it to run the outlet SCAT outside the intake/exhaust tubes, kind of laying on the cowl. With the custom muff, I was able to run the SCAT inside the intake/exhaust tubes. It's a tight fit, but doable. I believe running it on the inside is even easier with a Superior sump.
http://www.dualrudder.com/rv7/2006/05/18/947
Dave