Dave ,no it's not your friend if your not running a good muffler,my point exactly ! noise = bad performance most of the time,and makes it hard to jet the carb.but reversion can be your friend and enhance VE (volumetric efficiency) as I said above. We have mid range sag not because of the exhaust but do to the factory jetting in our stock carbs ,which is why the white spacer mod to lift the jet needle is so effective . Higher VE allows a better fuel charge into the cylinder which gives better hp/torque.

I've used the supertrap and appreciate it's ability to adjust the backpressure to affect the a/f mixture in finer detail than you can do with jets alone.

But if I were to mess with it further, I would put in the minimum disks and spring load the end cap for the best of both worlds... quiet at low throttle settings and wide open when I'm wide open.  

Given a choice, I'll take getting reversioned over reaccomodated.