GM GEN V LT Swap 2.5" Outlet Exhaust Manifolds, Hooker Blackheart These Hooker BlackHeart cast iron exhaust manifolds for the popular GM LT motor has a 2.5-inch outlet and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications. Their contoured design... MSRP: Was: Price: Now: $389.95 - $555.95 Quick view View Options