No fix
Sorry it took so long. Still no fix. I had an air intake on my last truck so I understand the increase in noise, but this is not a whistle, it is a loud "grumble" Took the whole sytem off and tried again and had everything tightened. Any time the engine is close to shifting or rpm increases you can hear the sound. As soon as I let off, it is gone. man this is driving me nuts.