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Aussie,Those are the cross-overs I mentioned in the previous post. They allow the gases to flow better between all four pipes -- between those firing simultaneously and those not -- to increase gas flow. This is supposed to increase low and mid range power. Those Kiwis are sharp.The craftsmanship of the pipe is pretty impressive. Chris has been very focused on details throughout the build, to use it to show people the range of what he can do. He's also rebuilding a CBX Turbo bike and a vintage Katana (both old school superbikes), but that's a different story for another forum.