ok! expertise required here!. Car runs fine and I replaced the standard manifolds with tubi ones some time ago. After returning from a hard run this evening I opened the hood to check and both manifolds were glowing a bit - which is normal if you look in the dark but the left hand manifold ( as you look at the engine) seemed more red than the other. This could be due to different airflow over each side of course. Any views at all?? car runs fun, does not run hot, no check lights!!!