exhause manifold
 

are there any aftermarket exhaust manifolds for these trucks, like somthing with better flow and size? i kno they make em for the cummins but havnt seen any for the 7.3l psd

only thing they make is headers, but they are not worth the cost.

Your no where near the mods needed for headers.

CSIPSD is right, you don't need headers. Maybe this will interest you Riffraff Diesel: Ceramic Coated Manifolds