Welcome to the club. I have the same model as you.
I have a 3" decat system, cosworth panel filter, 3 port boost solenoid, rcm fuel pump and remap. I get 276hp 280lb-ft. That is then limited by the TD04 turbo.
You can get those figures but anymore and you will need to replace the turbo.
I'd highly recommend the fuel pump to limit the chance of leaning out. As a guide a lot say the internals can take 350hp and that goes for the 5 speed gearbox too.