My recollection was that Tri Y came along first and then someone carried it a little further to the 180 deg headers that yoked cylinders from opposite sides of the engine together as pictured in an earlier post. Usually one side will yoke the side by side tubes together but the other side would yoke every other one together like the lower one above. All of the Tri Y headers that I've ever seen were different on each side because the firing order determined which tubes should be yoked together. This was done to try to space out the pulses in the system as they pass through the exhaust system. You can see on the bottom one that the second cylinder and the 4th cylinder are yoked together and the first and third are yoked together. Even though there are 3 Ys, these are not considered "Tri Y" headers. 2 adjacent cylinders are yoked together and then they are yoked together again farther down the line. ![]() There is a difference between "Tri Y" headers and 2-2-1 headers.
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