I just started noticing a change in performace from my 1.9 tdi beetle. I have a boost guage that is showing spikes in excessive of 25 + psi without much accelleration. There is even less performance under load in 5th gear at 100km/hr the boost guage is at 15 psi and the car is not pulling at all. Subsequently I'm staying off the highways, also I haven't had any codes yet because I'm keeping the boost under 15 psi but it obvious theres a problem. Does this sound like the N75?