RedLine Exhaust Manifold Part # 12581284
ECOTEC Exhaust Manifold Part # 90537679
1.The Head is another cast for the RL vs all the other ECOTEC engines, but the location of the studs are the same for both the intake and exhaust on both.
2. The injectors are the same for all ECOTEC engines except the RL which has larger volume injectors. They all feature the new Multec II style of plug, but are located on a removable harness and are basically 12-16 ohm injectors. (any 12-16 ohm injector could be used with a matching harness)