Quote Originally Posted by Explicit_Spade View Post
Its not a mod for gains. 04+ have the FPR in the stock pump. After upgrading fuel pumps, you have nothing to regulate pressure on the fuel system. Tengis suggested switching to a return style fuel system so you can use the FPR in the Series II rails.

This is a method of doing so where you don't need to swap the whole fuel system.
You have options... There is no magic involved in fuel pressure regulation in the tank/canister, its just about using the 04 or 05+ regulator setup. The "symptoms" of upgraded fuel pumps are unrelated to anything else here.