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Our Infra-Red Clearcoat '02 ZX5 has recently dipped into the 14-second zone with the addition of a Nitrous Express 75 hp wet nitrous system. Although impressive, our exhaust tone was anything but. We rectified the problem with a Focus Central shorty header and a 2 1/4-inch Magna Flow cat-back exhaust system. Did we gain any useable power, you ask? You'll have to read on to find out.