Building a new exhuast mid-pipe/muffler. Need advise.

[limeex2]

82 GS1100E. Stock motor, 36mm GSXR carbs. Have a Yosh race pipe that I am having a new exhaust mid-pipe custom built to fit a Cone Engineering race muffler. The muffler has a 2 1/2" outlet or a 3" outlet. Either end can be used. The smaller end has more back pressure. The bike will be run on the street and will see track days, but it is one of 4 bikes and will only be ridden 500-1000 miles a year. I dont care if it is loud or quiet, just the best set-up. If its noisy, it will be were no body cares or can hear it. What size outlet opening would you guys suggest? Thanks!