I have heard dark greens go to as much as 370 bhp but i personally think 360 bhp is the Max, you can run more fuel pressure for more bhp but there not designed to do so

Your spec should see a good soild 330 bhp poss more depending on what boost you are holding..

Ahmed bayjoo is the chip you have he is good at live maps but off the shelf chips can run a bit rich due to risks of Det so this covers that!!!

you don't say if you have cams etc this will make a bit more power but mainly more torque..

A T4 on greens is a bit much imo boost must come in late and hit with a big punch..

Hope this helps a bit