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You really don't need to mod the CTS-V. With 550 hp, you'll be spinning 1st gear, 2nd gear, and into 3rd gear. I expect any speed under 70 mph if you stomp it in the correct gear, you'll be going sideways. How fast do you intend on going? LOL I always thought 550-600 hp would be a reasonable limit for a street car personally.
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