that trainer is pretty reasonable compared to others i had looked at.
1.5 seems right, i was at 1 -3/8 up here at 700 ft. ASL before i knocked the dents in my Dom and messsed everything up.
the Dom. reconfiguration isn't really very dif. from the stock layout.
picture this; the first segment ( with the flange ) is turned over, going up and to the right, the second segment ( 180* "U" piece) is removed and replace with a 90* sweep the same length as the "U", the third segment (expansion chamber) is then attached and because it has a 90* sweep designed into it brings chamber and silencer down BEHIND the engine more than just over the clutch. it also points the outlet down which should ad another degree of quietness.
there have been a couple VERY good pipes made for these engines by people that were part of the gopednation group. unfortunately they are no longer being built. this reconfiguration of the Dom. is very close to one that was considered to be the best of mid-high end designs.
i'm hoping to have the pipe back together by the end of the week.
steve