I'm wanting to add dual exhaust to my 4.9l 6 what's the best route to go

 

Some auto supply stores will show the options for what is available to alter some exhaust systems. Sometimes exhaust repair shops will be better able to provide what options are available . Never hurts to check around.

 

the 90 model f150 had a exhaust manifold for dual exhaust was wondering if that would fit later model head like a 79 4.9l versus headers