Potential Leak/ Whispering Noise

[MidWest312]

Hey y’all, 

I bought a 2017 silverado single cab a few months ago and noticed it had a weird (exhaust leak sounding) noise and never really thought much about it. I figured it was an exhaust leak or loose clamp. Well, since the. I have done headers and full length exhaust and noticed it’s getting worse. It sounds like an exhaust leak/whispering noise and it’s at different loads. From 20-60 you will hear it. I have checked it’s not the exhaust and I don’t have any leaks. Any idea what his could be? I’m running headers and a dual X pipe exhaust (3” pipe) till the axel and then dumped. I have band clamps from headers back. 

Any advice would be helpful. 

 

Side note: No cats and V4 mode has been disabled through the tube so far 

[MidWest312]

Now I’m just starting to think it’s nornal or the headers since they’re thinner than manifolds ? Maybe