Hello all, have been having a very annoying problem with my subie. I have a 2005 legacy gt with a turbo back exhaust and a pro tune. At around 2400-3000rpm anything above 2-4psi of boost will cause knock on my access port and what feels like the engine choking or losing power.this does not happen at wot, or if I let the RPMs build up without boost. I’m at 110k miles, no check engine light. Original 02 sensors, cleaned maf a few months ago. Tuner thinks it’s a fuel pump as he’s had to add more fuel when he shouldn’t have to. Any insight would help a lot. This knock happens on his tune, on the base Cobb tune and oem edu.