Headers

[Steve Tinker]

Doug,
Concerning your vibration, there was a slight vibration hum on mine when I fitted my headers.
Like you, tightening the header bolts didn't make any difference.
So I loosend the triangular 3 bolt connections to the mid pipes and as I unbolted the 3 bolts I found that there was a large gap appearing between the headers and mid pipes. So I also loosend the mid pipe connections to the muffler - pulling the "slip on" fit out towards the headers and closing the gap. My vibration seems to have been caused by too much tension placed on the headers - maybe they were slightly shorter than the originals.
Slackening off everything & readjusting the pipework has worked for me - hope it helps you too.

[Frodo]

Originally Posted by Steve Tinker

Doug,
Concerning your vibration, there was a slight vibration hum on mine when I fitted my headers.
Like you, tightening the header bolts didn't make any difference.
So I loosend the triangular 3 bolt connections to the mid pipes and as I unbolted the 3 bolts I found that there was a large gap appearing between the headers and mid pipes. So I also loosend the mid pipe connections to the muffler - pulling the "slip on" fit out towards the headers and closing the gap. My vibration seems to have been caused by too much tension placed on the headers - maybe they were slightly shorter than the originals.
Slackening off everything & readjusting the pipework has worked for me - hope it helps you too.

This sounds really intriguing to me...call it a gut feeling, but I suspect this may just be what's going on in my case as well. What you describe sure sounds like it would create the kind of sound I'm hearing. I'll check into it and report back...eventually!