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99sidude said:Do not buy any ebay brand "high flow cats"; you will get a test pipe. I have heard good things about magnaflow cats, and carsound. Catco makes a direct fit hight flow catalytic converter for your car too. I ran one on my old 99' si, and was pleased with the quality.
Random Technology is another brand that makes a high flow cat. I havn't heard much about them, other than that they differ in design from the rest mentioned, and cost more.