So i have a 2005 Silverado Z71 crew cab and i have a flowmaster dual exhaust on it now with stock manifolds! i am wanting to put headers on it but i cant decide with which ones to go with! Any Help?  

BORLA, HOOKER, GIBSON are all good headers. I dont know all the numbers but i've heard them change the tone of the engine greatly. Hooker has been around for years and really know their trucks.

http://www.autopartswarehouse.com/search/?D=chevy+silverado+headers&Ntt=chevy+silverado+headers&Dx=mode+matchall&Ntk=Main&Ntx=mode+matchallpartial&N=4294967000&Nty=1  

Borla