40 Series - 2.50" IN(C)/OUT(O) - Aggressive Sound CHEVROLET/GMC Our BD upgraded Manifolds address

Our BD upgraded Manifolds address common exhaust Manifold bolt failures by incorporating two additional bolt holes and by utilizing extended fasteners and spacers to better withstand thermal expansion

Constructed of hard coated black stamped steel

Anodized billet aluminum adapter fitting with retaining bolt

injector O-rings and seal washers

7L Cummins 2007

40 Series - 2.50" IN(C)/OUT(O) - Aggressive Sound CHEVROLET/GMC Our BD upgraded Manifolds addressThe Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.