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This XR1 Series GT3788 Turbocharger comes with an upgraded Billet Blade Technology 64mm compressor wheel. The Billet Blade Technology 64mm compressor wheel is designed to increase turbo efficiency to help lower EGT's while adding strength and reliability. The increased compressor wheel size of the XR1 will help increase performance when running larger injectors and/or tuning where the factory sized turbo can no longer keep up.