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3 The highlight of the supercharger upgrade was of course the Twin-Screw supercharger. The KB GT500 kit is available with either the 2.8L or 3.6L blower. The 2.8L is an attractive option as it fit under the stock hood while the larger 3.6L required an aftermarket hood. Even the smaller 2.8L is capable of supporting 1,000 hp.