vti4mark

that looks loving the head lights and wheels.

71k on a v, so hopefully only around halfway in it life

to anwser your question, you need to get it tuned as adding more air and not the fuel is not going to work. as for low boost could be loads off thing and as you have just built it up your going to run in to loads off little problems like this. my old erst was an arse when i rebuilt that spent near £4k on the engine on all the right bits to make it 300bhp safely, but it needed 8 hours off tuning and trying diffrent maps to get it right . hang in there, get it mapped, then enjoy driving it.