Hi, got a question regarding boost on my 2wd Saff. I have noticed a boost pressure drop when the revs get up around 5000RPM. Boost runs at 20 PSI until this point and then it drops, sometimes as low as 13 PSI but usually to about 16 PSI. Is this normal? The car has usual mods, i.e. 803's, 3bar, chip, Mongoose 3" etc but i am yet to fit a cold side bov and RS500 size intercooler. Turbo is standard as far as i know.