I have a pypes tru cat back exhaust on my 2010 4.0. It was installed about 5 months ago at my uncles shop. Yesterday when I started it up after leaving work and i heard this rattling coming from around the muffler area. After a minute it stopped. so put it in drive and away i went. noticed as at the lower rpms or while staying with the same rpms for a slight period of time that it came back. Also upon hitting slight bumps heard what sounded like a clunk noise as if it was hitting something. So today when i started it before work same problem without the clunk. Was wondering if it is a serious problem. Obviously i dont want it to stay or sound like that and was just wondering if this is a simple fix or back to the shop.

 

I'd take a look at the rubber centers on the Pypes muffler hangers. I had a pair of those where the rubber dry rotted and cracked in about 6 months

 

Think its that simple? If they are, Do I have to buy the pypes hangers or could i get a different brand

 

As far as I know, the Pypes hangers or factory one's from a dealership are the only options.

 

thank you i appreciate your input and ill take a look

 

also check the clamps up where the x pipe is. I had a rattle that would only happen when it warmed up was the rear exhaust hanger on the driverside muffler would rub the rear bumper but only when it expanded from heat. just ground it down a little.

Its not a rattle like a blown baffle in the muffler is it?

 

Check the hangers, my muffler hooks were touching the hangers and causing a vibration. foam tape cured that.