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You are unlikely to ever hit top speed in this car even with the 4.8 let alone the 4.55. But you will get to your desired speed faster with the more aggressive gears. It will be quicker. As for faster... Who cares? I've had my car up to 125 at TWS and ran out of front straight. It actually WOULD be faster there even if in theory my top speed would drop a bit. I never hit top speed and don't plan to. Higher rpm on the highway wouldn't be a big deal. 10-20%
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