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Originally Posted by Diamondrev
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Wow, blast from the past haha. Anyways I skimmed the article and it doesn't specify (from what I can tell) if they removed the stock cat. Removing the stock cat & catback for a test pipe and 3" catback actually provided noticeable gains on my car (although it was boosted prior to the install of those parts). That cat is quite restrictive, but I highly doubt 20hp out of a test pipe on a n/t.