I need some advice on who makes some long tubes for a 99 5.3 and what it consist of installing them. I need to know if the cats have to be relocated, or any useful information when installing.

 

ASM and Dynatech make long tubes,TOG make a good mid-length tube and Thorley makes a fairly long tri-wye header.As for the installation you can count on an all night marathon complete with cut nuckles and cursing.You will need someone to wield up the exhaust on all but the Dynatechs with come with hi-flo cats on a new wye-pipe.