I am ordering full exhaust then when I get the money will get the 15" Rota Subzeros. Anyway I decided on the DC Sports one piece 4-2-1 header Stainless Steel, Apex World Sport cat-back and Carsound Catalytic Converter. On ipsracing.com they sell 2.5" and 2.25" cats but don't list on for the EX civic, only Integra and SI civics. Do they make a specific one for my car or do I need to tell them the specs myself? Also does having the aftermarket header and catback change what cat I will have to order? Thanks, my car is coming together nicely.