I have a magna flow high cat, 2 1/2" piping and a wicked flow muffler. At high rpms there is a rattling noise coming from the muffler. Anyone experience this or know if the muffler is defective or is just normal do to higher flow from the cat?

 

its probably just how the muffler sounds.
why a wicked flow??

 

I know.... The muffler shop guy said it was just as good as all the others and I went off of his word/experience. But I hate the rattling and will probably change out the muffler. But I want to know if its just the muffler or if it is also the cat. I don't want to buy another muffler and have the same noise.

 

some cheap mufflers , start to fall apart on the insides and will almost sound like you have sand in them if you tip it , I would look for a name brand catback from a reputible company.. My guess would be the muffler. I have vibrant header with high flow cat and skunk2 catback and have no rattle's..