I saw an advertisment from Shelby American which had all his manifolds spread out around a young lady in a cowboy hat. In the description for this manifold, "they" claim it to be satisfactory for street operation. By the way it behaves right now, I have to agree. The car actually runs smoother right now, even the sound is smoother / calmer than with the dual plane!

Now I just have to wait for the snow / ice and the salted roads to go away.