Well, I finally got around to putting on my manifolds. I have to order some gasless flux core stainless steel mig wire to finish up for my collector reducers. Seems like stainless anyway. Does anyone know what kind of material it is? Also, I guess they might have changed the O2 sensor connectors recently. My O2 extension does not plug in. Luckily, I didn't need it anyway I guess. The center two port on the cast manifold are very restricted. I got the manifolds, bolts, gaskets, and mids for 260 bucks locally. They are off a 13 Charger with 4k miles.