Thanks for the link. But I'm still mystified as to why the firing order, and hence, pulses, doesn't change the joining order of the pipes, it's always 1 and 4, 2 and 3, on a 4/2/1 system on a 4 cylinder engine unless it's full race with a straight 4 into 1 system. Any one else got ideas?

Hi fellas, can anyone detail what happens when the WRONG extractors are fitted to a 100kw Redtop. By wrong, I mean that a 4 into 2 into 1 system where pipes 1 and 3, and 2 and 4 are joined instead of the conventional 1 and 4, 2 and 3. What effect would it have on power, will the engine run hotter, w...