This is a full set (4) of Xtreme DI (XDI) increased flow injectors for your LTG powered vehicle. These injectors install in place of the stock injectors and provide up to 50% more flow over stock. 

+50% more flow at 100bar

+36% more flow at 200bar

Each set of injectors includes a spec sheet with calibration data. PCM tuning is needed with these injectors. If you are unsure of what portion of your fuel system is limited on your current setup consult your tuner before purchasing any fuel system upgrades.