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Finally, we bolted the C&L intake manifold on with the GT500 throttle body. Peak power improved to 429 horsepower, and adding a single-blade throttle body improved performance further to 435.90. The C&L piece really flows some air, so the better throttle body is going to be needed to make sure it lives up to its potential. In other areas under the curve, the single-blade was good for as much as 8 to 9 rear-wheel horsepower.