I am wondering if the 2.5" collector is the way to go since its a tri y design and having a 3" collector might not help out with flow all that much since its not a 4 tube design. Its only the 2 larger tubes entering into that area for the collector and not 4. One might be able to just run a 3" pipe off of the 2.5" collector to help with the ground clearance issuse only with the 3" collector.
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