testpipe.com, 1-877-722-3784. they usually have good prices and can do just about anything for you.
BTW i have the JDM 4-1 with 2.5" collector so i have the cat with 3" flange on the front and 2.5" rear flange for the cat-back. if you are going mild, like with a 4-2-1 DC Sports, then get the 2.25" cat in stock length so it's matched with the header/cat-back.
or if you think you will go big (headwork, cams, high C/R) later on then get the JDM 4-1 with the 2.5" cat/cat-back.
the JDM header and 2.5" Carsound cat is a nice setup and works very well. let's just say my B18C1 is opened up now.
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