I installed the Dynomax 39523 cat back 2 months ago and have continued struggling with drone around 60mph. While making a final decision to return under their sound guarantee I decided to research a bit more. I read that my clamps could be the cause of the drone (which is typically caused by a leak on the pipe). Is this correct? One thread I said to replace with U bolt clamps 2 1/2 with 5/8 bolts. Apparently this will help provide a tighter seal.

Here are the current clamps I have:








Any experience here? Am I better off changing the clamps out? Or is thee something I can do with these? Or am I way off track.

One side note, I am running 35s with 4.56 gears if that helps.

Thanks

 

How about a Helmholtz pipe? They work great, and are not especially expensive.

 

I've done a lot of exhaust installations using kits like this and/or full custom systems as an underbody mechanic and have never seen clamps be the cause of droning. They could lead and cause a completely different sound. Drone is from resonation.

 

I find that pointing the tail pipe in different directions creates different exhaust tones.

 

This must be custom fabricated, right?

 

I bought one that was already made and had a muffler shop put it on my truck. It made a huge difference.