The title covers it. I am putting a B20 in to my hatch this weekend. I have a CTR header that I am going to throw on there. And I have the Tanabe Super Racing Medallion cat-back (civic hatch application) that I will be putting on there as well. The thing is, the CTR header obviously has the 2.5" collector, while the Tanabe piping is not 2.5" (I don't even know what it is, 2.25", 2.3"?), so how will I go about connecting the two? Whether it be a high-flow cat or a test pipe, it doesn't matter. But who makes what I need?? Carsound, Random Tech, or should I go custom?? And where can I get it ASAP. Any and all help appreciated people, thanks.