i just got my car flashed at euro tech a couple of days ago, with giac.(its a 03 jetta 1.8t) the car runs great but i havea lil problem. my boost surges in higher gears. it goes back and forth betwee 17 and 20 psi when WOT. then i also see it go around 15 psi or 14psi at high rpms, but i think thats normal but i dont think the surging is normal. ive heard a lil about getting a new n75 valve but brian at Euro tech said i shouldnt do it. i dont know what to do. can any one help?