i have a electronic boost controller (Greddy Profec B Spec 2), and the cars pretty much stock except a cat back exhaust. im having a top boost of 11psi but it drops to 8.7 nearby redline. what do you guys think the problem is?
I don't think i have any boost leak as i dynoed it to check and the unique auto sports guys says its normal for the stock turbo but they also said a cat back exhaust will help the boost drop less, but it didn't do that.
What do you guys think the problem is? i really want a full 11psi boost to redline.
by the way the car is GTT R34