This is a replacement increased volume high pressure fuel pump for your Cadillac ATS-V. The XDI upgraded high pressure fuel pump starts with an OEM LF4 high pressure fuel pump and adds the Autotech high volume internals/piston. Direct bolt on in place of stock. Compatible with gasoline and ethanol. 

Approximately 36% increase in volume over stock. 

Fits: 2016-2019 Cadillac ATS-V. Also fits LF3 vehicles.