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The pictures of the underside show the loooonnngg primary header tubes. I think I told you that I had heard that long primaries tend to enhance low to mid range power. I may have over done it a bit. There is an oxygen sensor on the outside of the left header. That is there for two reasons. First, I bought an air/fuel ratio monitor to help tune the carbs. Second, I'm hoping in the future to build an electronic fuel injection intake. The headers connect to a 3 inch exhaust system with Flowmaster 50 series Delta Flow mufflers. The 'H' pipe is 2 1/2 inch. Everything is metalic ceramic coated.