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Challenger SRT Supercharged with HEMI Hellcat engine based on Audi R8 V10 Unreal Engine 4 Space Engine engine mid engine Source Engine V6 3 5 Twin Turbo EcoBoost engine R8 V10 Quattro GT MF5 V10 star engine R8 V10 Quattro spyder based on Audi R8 V10 spyder engine exhaust Audi R8 V10