i have a 07 classic sierra 4.3 i was wanting to know if someone makes longtube headers for it . i have a k&n air intake and flowmaster duals but i would like to put longtubes and true duals with some magnaflows. i have found a mass air flow and do they make a supercharger for it

 

I dont know about a supercharger, but I have seen some sick Twin Turbo v6's...

AS far as headers, check out...

Force Fed Fabs Long Tube Headers

A guy on a local board has them on his v6 firebird.

Stay with a single exhaust...true duals is overkill for a v6, and will kill your lower torque.

 

best bang for your buck is a tune!