longtubes are chattering off what sounds like floor panels. i read that poly mounts have helped that for some people. whats next if they dont fix this? they make just as much noise.. thay are prothane mounts from summit. thanks

 

They must be making contact somewhere. You need to find it and eliminate the contact.....or get some better fitting headers.

 

Lower your transmission crossmember using 1/4" square washers. This will lower the collectors away from the floor. Takes 10 minutes and fixed.

 

good idea.. i will try that. thanks

 

Dont overdo it or you might get driveline vibes. Start with 1/4". Should not take more than 1/2" or so.