Evening, having a small issue with my 2002sti car has a miltek decatted and cosworth panel filter. Car was mapped at 1.15bar by powerstation. Had it on the rollers Saturday. To find it boosts to 1.1.5 then tails of to under 1.05bar. So a leak somewhere. How would I go about finding the leak. I've checked intercooler pipework..

 

most turbos will trail off boost at high end, espically the standard if thats what you mean