Car feels a bit slower, lower boost at top end is noticeable. today i've installed a coupler that fits directly on the fuel pump to increase the fuel pressure. Later this week I'm also placing a new filter for the walbro. Its a bit strange that the Walbro 450-274 is having trouble with the pressure, is it due to the HPFP or the LPFP thats not delivering enough pressure? Hopefully the fuel filter and coupler can make a difference. So that we can get back to the 21 psi.