First thought on that is the fuel filter Luke. Second is a dirty MAF, third is a sticky/lazy FPR, fourth, broken/loose baffle in one of the exhaust boxes causing a temporary blockage (could even be the cat) and fifth is a sticky wastegate so it's not giving you the boost you should be getting.
Could also be the fuel pick up in the tank but the only way is to check through everything methodically. Might be a lazy/worn fuel pimp as well, got a feeling you said you changed the pump though or was that your mate who has bought the red one?
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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