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As Eggen lays out the exhaust system, he holds off on completely welding everything up until moving the entire X/I-pipe assembly onto a worktable. It's much easier to break a tack weld in case you have to correct a mistake, and looking at the entire X/I-pipe on the table makes it easier to eliminate the gaps between each tube. Gaps tend to shift the exhaust pipes in different directions, and a small gap near the front of the car can result in a pipe that's off by several inches in the rear of the car. After throwing down the final welds to the X/I-pipe assembly, it was bolted in place.