so from my observations, if you have a 9 and are only looking to the most basic mods (TBE, intake, MBC), then the stock fuel pump IS sufficient to handle the fuel flow demands.

We learned a few interesting things, especially with the EVO VIII & IX pumps. The EVO VIII pump has a pressure relief valve that opens up at around 65-68psi and the flow output drops dramatically after that, eventually going to zero flow around 75-80psi. The IX pump flows a little more than the VIII pump at lower pressures but doesn't dump the flow at higher pressures. That's the reason you can make decent power at higher boost levels with the IX pump.