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Re: Hi-Flow Cat for 2005 Cavalier
Depending on exactly what you've done, anywere from none to 10...maybe. More likely you would only see a couple if any. Just being hi flow doesn't add horsepower. If the stock system could "breath" easy to begin with, upgrading the system may not yield any performance increase.
Using an O2 simulator is against federal law for street use on polution controlled vehicles.
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Vinyl adds horsepower, right?
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