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I briefly had the 3" DP/TP with a 2.5" catback on my Sport 530BB car before going to 3" all the way. The 3" DP/TP made the biggest different, and raised my boost 2 full PSI before I turned it down. The 3" catback helped the car hold boost longer and make more power after the torque peak. So the 3" DP/TP with 2.5" catback offers big power gains. The 3" cat-back offers more top-end, and an amazing sound! I don't know what you'd expect with DP alone, but my resluts with the 3" DP/TP were great!
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