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Now it's time to start the after-cat exhaust-system install. Since we're doing this portion at Stainless Works and prototyping the system at the same time, the photos may look a little strange, but the steps should be identical for end users. First, we raised and supported the Pontiac on a lift, installed the normal '04-style crossover pipe, and loosely fit the custom-made mufflers in the stock location. This is a straightforward process that requires little fanfare.