Outer Limits 4x4 Board

I was driving along the other day when my ute started roaring. I was close to the shop that put the muffler on for me about 3 months ago, so i crawled around there and we had a look. The muffler had cut cleanly at a weld about half way along. It wasn't hitting anything, and all the rubber mounts were holding it fine. I know Zooks are rough, but that wouldn't sever it cleanly like that.

The muffler man said that it was most likely caused by harmonics, a certain frequency of sound or vibrations at a certain rev range must be setting up a vibration that caused the problem. To his credit he rewelded it for free, and said that if it happens again i might need a "bellows" installed in the pipe somewhere. (This is basically a section of hose made out of woven metal bands, which acts as a shock absorber).

I was just wondering if anyone had ever heard of this before?

Puk

Bellows are an excellent idea.

I'd just say it's straight up vibration. I've seen lots of broken exhausts on sierras.

Steve.

When I had my system made I used to crack the exhaust right at the flange to the muffler everytime I went offroad. It was welded back up 3 times before a flex joint was put in. Once this was fitted I never had a problem again.

mine was made and it was "sleeved" over the muffler and welded... ie: it overlaps... this way, should a weld brake ill get a rattle but not a v8 =)