Pair of LH and RH ram air over size D-port exhaust manifolds. Collector opening is 2.45" rather than 2.20" LH: 977646 and RH: 977642. Castings are much higher quality than what you receive from the catalog suppliers, you know who they are. Castings have correct port detail, ports are cnc'd and interior of castings are detailed ready to run. Flange confiquration is crisp and correct. Castings from catalog suppliers have poor detail, they also cast with 2 part numers and gring off extra number depending on application. Competitors have terrible port detail and weigh 30% more. Lifetime Guarantee on materials and workmanship. If you are running over 400 hp then we suggest going with these Ram Air Headers using 2.50" or 3" exhaust pipes. You will need to purchase the PFL-OS-1 -3 bolt flange (2-required). Installation hardware kit # PH-1-2.5" and the D-port exhaust manifold gaskets are sold on the page @ $29.00 set. Optional Cermaic coating as shown in photo's is avaiable. Both castings are port- matched to Pontiac blueprint then thermal barrier coating is applied and cured on interior and exterior. Choice of Silver or Gray. 3-year guarantee. Will not burn off,fade or peel. Reduces header temperture 40%. Silver is Chrome-like. Gray looks stock.
- These are MADE IN USA. The majority of the manifolds on the market are made in China