The only headers shown have been poor quality makeshift ones with sloppy welds. If there's a good set out there on a running car pictures would be nice. I don't think a "good" set has been made to truly test the gains here. I'm sure the stock manifolds could see an upgrade though stock is never optimal.
Originally Posted by ACRucrazy
A member spent a whole weekend swapping out his stock manifolds for headers. Before and after dynos. Lets just say the stockers went back on.