My stock pump with stock sticks could maintained 2800 psi on a PHP 140 tune, it could not maintain over 2200 psi with my 175/80's, PHP tuning, 2.7 ms PW.
Put a new pump in, MB stage 1. same issue but was maintaining about 2500 psi. still 2.7 ms.
Put a MB stage 2 in, maintains 3200 psi all...