I love it when a plan comes together. I got Ed to show me previously unseen hard data on how effective the splitters are at noise reduction. :-) Now I need to know how much hp is really lost. In order to determine that, I need 1st to know how the difference *using the same exhaust system*. Then I need to know how much is lost in the extra 'muffling' needed to reduce the clean ported system by 8 dB. Then I need to know how much weight is added by the extra 'muffling'. Then how much drag is added by the extra muffling hanging out in the airstream.  I think Tracy said that his current belly mounted muffler is costing somewhere between 3-5 mph. Looking at the cube function of airspeed/hp, how many hp does it take to recover 5 mph at 200 mph? Can I arrive at the same net performance with a smaller in-cowl muffler & some careful heat shielding?

BTW, Bill's right about the name & design details (expanded pipe around the cone) of Anti-reversion cones. Again, a plan comes together as I learned more new stuff. I knew the design details but wasn't aware of Jim Fueling. Thanks, Bill.

Sometimes dumb questions (or statements) yield some pretty intelligent thoughts & useful data. Onward, through the fog...

Charlie