Seem to hae boost issues... car used to run side by side with my mates cupra that i know for a fact boosts 8/9 psi, mine died down to 5/6 so i got an n75F thinking it may be the difference, one way it only boosted to 6 still so reersed it and found it boosted properly.... thing is it sometimes spikes high, overboosts, and flies into limp mode... so... i thouhgt lets try a different n75c... still only 5 psi... is it possible to tweak the F valve so that it doesnt spike quite so high!?