Wow, 8200 rpm? Mine reaches peak at just over 7k, and honestly the torque curve feels like shifting just below 7k keeps the acceleration up. I used Pauter rods etc. more as missed shift high rev "insurance".
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Initially I had a 2 in 2 out M&K with headers (no heat), and loved the sound and light weight. Since then I had a dansk muffler modified inside, and added two 2 1/2" exit pipes centered 12" apart. It's the "old school" design we used to make back in the '70s. Also switched to Bursch headers. The sound is a little louder than the M&K, crisper, with a bit more mechanical snarl. For my taste, it is perfect. You are going to love your engine, I can't wait to see it in person!!!!!!! Congratulations.