Originally Posted by UGOTKERN

We had the same issue, turns out the pipe/flange that connects directly to the manifold had loosened slightly causing the pipe to drop and make contact on the crossmember. It wasnt loose enough to cause a exhaust leak but only enough to where the pipe qould drop to lay on the cross member. .I simply placed a spacer between the pipe and cross member and the pipe.... tighented the bolts on the manifold flange... removed the spacer and everything is good to go!

Originally Posted by albrechtmj

That's what I have done twice now.

Somehow it keeps loosening and coming back.

Originally Posted by JAM85

I have the offroad exhaust and I just started getting the rattle to, but its not all the time. I have it while accelerating at times then I can let off it then throttle again and it goes away Going to double check to make sure nothing is rubbing. Besides this little issue, this exhaust rocks.

Originally Posted by MBRP Tech 1

If I'm not mistaken, this issue is not with your cat-back but actually your factory Y pipe coming in contact with the cross member? Am I looking at this wrong?

Originally Posted by albrechtmj

It is my factory Y pipe hitting the crossmember, but that is the symptom.

The cause is that the cat-back is "pulling down" on the factory exhaust, causing the contact/rattle.