Ok I am running a td06 20g, full exhaust, factory motor. Usually around 12psi @ WOT the car will all of the sudden lose power and the exhaust will sound like its not firing 100% it sounds deep and weak sounding. It like a big thuding noise, its really weird. It is also not very consistent, sometimes I can creep and hit 14psi and it won't do it then all of the sudden it will. I have also had it do it on lower boost? Anyone have any ideas?