From Vetterman
Hi Bob888, I missed out on the earlier thread so perhaps some of the following suggestions you have already addressed.
Have you pulled off the muffler shrouds to inspect the muffler cans for cracks?
FYI we have never had one crack, but there?s a first time for everything.
Have you looked at the slip joints where the primary pipes go into the collector?
All of these will leak a very small amount, but occasionally the amount grows over many hours and a slip joint will need to be resized.
There?s lots going on inside a cowling and air does funny things. I?m guessing you?ve looked for leaks in the firewall area.
As always, feel free to give us a call if we can help.
Clint Busenitz/ Vetterman Exhaust