The wine is from the air intake it is actually louder if u put a cold air intake on it there is no fix for it its just how they have there intakes made i put an aftermarket muffler on it and it didnt take away the whistle i put and ckld air on my truck and it made it louder but when i gutted my cats it fixed the whistle whats goin on is the motor is pulling in so much air and u have way to much back pressure for the motor the intake pulls in air as the back pressure is tryin to push it back into the motor
