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Not much of an improvement for that much coin, not to mention install cost. For drag it would be cool, but do people really - and I mean really - drag these things? If you are, you should've bought a proper drag car...e.g. 09 CTS-V or C63.
And if you road race/track the car, spend the money on tires and brake pads/rotors/lines. Just my 2 cents...
-Rich
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