I ordered a JDM B18C swap from HMO and the motor is a 96. The motor sits perfect but my problem is the following: - The collector on the JDM B18C exhaust manifold is to big to fit my EX Cat. I think the outlet is 2.5. what year USDM GSR Exhaust manifold/header do I need to bolt up to my EX cat? Would it be better for me to get a GSR cat. Which year will fit the 99 EX and bolt up to an aftermarket header? From what i have seen the 94-97 GSR Exhaust Manifolds/headers are longer and have an o2 bung for the primary o2 sensor in the header. The 98-01 GSR are shorter and the primary o2 is located on the GSR Cat. PLEASE HELP!!!!!