Theuns,

May I ask how old your setup is? What fuel are you using? You seem to have a lot of carmelization on the header and pipe. Have you run it too lean? Just curious. BTW, I had a BVM .96/Viofan setup in a Y/A A-4. The inlets on that plane were, by all 'expert' opinion, all wrong. WAY less than 100% of FSA, curvy and LOUD. On the ground, at 23k, the plane didn't push on my hand much, but once in the air, she hauled butt. If you're satisfied that you're getting peak RPM, why not just fly it and see what you think of the actual in-flight performance.