TURBO HEADER MUFFLER Saito 91 (no optional baffle), Saito 65 (with baffle), Saito 72 (with baffle)

Saito 91 APC 14-6 Omega 15% 52F 9400 with stock machined muffler (not cast) 9700 with Turbo Header Muffler

Saito 65 APC 13-6 Omega 15% 52F 9760 with stock machined muffler (not cast) 9950 with Turbo Header Muffler With/Baffle

Saito 72 APC 13-6 Omega 15% 52F 10460 with cast muffler 10700 with Turbo Muffler and baffle

Saito 80 APC 14-6 Omega 15% 52F 8900 with stock machined muffler (not cast) 8900 with Turbo Header and baffle. 9000 with Turbo header and no baffle. Don't know what the deal was with this engine? The results do not correlate with the 82 tests done previously.
The engine doesn't have much running time. Perhaps the engine would have been more responsive to the muffler when running a smaller prop like a 13 1/2 X 6 or a 13-7?

None of the engines sounded like a straight pipe with the Turbo Header. I thought the sound was nice. I do not have a db meter but the impression to me was that the Turbo Header was no louder than a stock muffler. I liked the sound.