Message: I have a 2001 5.9 Quad Cab, and I have installed a Cat Back exhaust system. I am waiting for the K&N filter system to be available now. I am also interested in installing headers. What headers are available for my truck? Will they void the warrantee? Is there a upgrade Y Pipe available, and will that void the warrantee as well?
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Subject: 5.9 & headers.