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Aren't you guys over looking a few things. If you car is putting down 305hp at the wheels, how are you getting beat by a v6 that puts out 300 hp at the flywheel????? Maybe it isn't the engine at all that is under performing.....
If one dealer doesn't do anything for you, take it to another. I don't understand why no one has done this, but the best thing to do is take it too a good tuner and have them scan your car on the dyno and road. This will show what the engine is doing and why. Could be as simple as a sensor reading improperly thus the pcm is reducing power.
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