ive just got the S2 ready for the MOT on friday as i have restored it..I took it for a 12 mile run this afternoon and its only boosting to 4 psi.

It was std, but i have bought and put on -

-31 act
pace intercooler
MD chip
samcos all round
k&n
mongoose zorst
uprated fuel pump
new amal valve which does click and work

And it still feels piss weak under load, hardly any boost at all. Its had a new engine top and bottom 5k ago, it drives lovely and smooth and ticks over great...But 4 psi for all the above makes me wanna go buy a corsa (PMSL id rather run 2 psi than own a corsa..lol)

plz help

a distressed RS owner...