The Raptor 4G is designed to supply your engine with additional fuel supply for those that have added a programmer and/or performance injectors that demand additional fueling. This particular pump is designed to deliver 150 gallons per hour (GPH) at 75 PSI and will replace your stock fuel pump.
Unsure of whether you need the Raptor 100 or the Raptor 150?
Put it this way...if your truck is stock, or moderately stock (70hp chip) you want the 100. If you've added a chip or two or larger injectors, you will want the 150.
What is the difference between the 10 PSI and 75 PSI models?
The 10 PSI models are designed to work with your stock or high pressure lift pump. The 75 PSI models are replacement pumps for your high pressure lift pumps.