986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post

Steve Tinker · 05-22-2012, 05:31 PM

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.

05-22-2012, 05:31 PM	#13
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	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. __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.