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Using an electric saw, Steve Garsky of RRP cut a section of the intermediate pipe equal in length to the cutout/Y-pipe assembly itself. Any area between the header collector (or behind the catalytic converter) and the mufflers will work fine. The farther rearward the cutout is positioned, the less resonance there will be inside the cabin. This particular install was on a truck, but the process is universal and applies to virtually all vehicle platforms.