so I pulled the engine on my v1 to do some work and on refitting it's only hitting 1.0 bar max rather than the 1.1 it normally gets.

i did change the headers from oe to syms equal length tubular headers, and I also put new age coil packs on, but neither of these would affect boost pressure would they?

ive checked all the pipes from turbo to intake and they seem fine.

Is there an easy way of checking the seal on my forge recirc valve to see if boost pressure is escaping there?

Im pretty sure all my vac pipes are good, but is there one that might cause this that I should check/replace to be sure?

i appreciate this is a real 'finger in the air' problem but if anyone can suggest some likely suspects to check first it would be helpful.