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Bart's frugal scheme was to use nothing but the Borla kit's unused pipe sections to complete the system. These would be cut as needed. Here, the piece he just cut off the Y-pipe has been trimmed shorter, slipped over the intermediate pipe, and reoriented to best bring it in line with the remainder of the Y-pipe, leaving just a small gap to be filled. The tricky part was that this gap wasn't straight, and required a curving section to join the two pipes-thus explaining the need for calipers and concentration.