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Can some one please tell my what the biggest difference (pros and cons) is between the off road extension pipes and the catted extension pipes?
Is there a much of a difference in HP or emissions/pollution? Is it mainly just a difference in sound? I think I want the catted extension pipes because they would be more likely to pass an emissions test, disregarding the visual inspection and would put out less pollution but don't want to spend the extra dollars if it is pointless. Plus, I have another 3 years before I am required to do an emissions test anyway.
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