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um?? no u only need a test pipe for trubo and stuff. A high flow cat u can use it for anything. Why not use a high flow cat on natural asperated? IT doesnt hurt nothin and it acutally helps. Talk to the guys from Hytech. They make very nice cats and they put out some nice gains and they got dynos to prove it
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2003 Apex Silver Mitsubishi Evolution 8
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