Don't rush it and try to get them in before the Nats. The chances of getting the headers and y-pipe all installed and lined up properly are slim. I would seriously wait until you can do the motor mounts at the same time. There's no good reason to rush the header install especially if you won't be able to get it tuned right away.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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