PDR recommends it is best to not have more pump (rating of GPH) than what is needed for a given application, as the pump will live a shorter life by bypassing more than normal. For example: A stock engine to 600rwhp truck should run a 95gal per hr pump, as a 150gph pump would not benifit the engine at all. The engine isn't capable of using that much fuel and would be bypassing it's life away. Also the 150gph systems tend to be louder units, which can be anoying for a everyday driver. 150gph or higher units are for the extreme hp aplications only.

 

Pump only units are not filtered and require the customer to use the engines stock filter unit or a after market system.