What model Integra are you looking to install this header on? It says it is for a B18C5 which is a Type R, so is this going on a GSR /LS/GS with modifications or is it going onto a Type R? If going on a Type R kiss your 4 bills goodbye. The factory Type R manifold is hard to beat. If going onto a GSR/LS/GS, why not secure a factory Type R manifold and have that fit to order? It will give you an OEM look and the power you are looking for.