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I already have 3' magnaflow, intercooler hardpipe kit, 3' downpipe and cat delete pipe with a blitz drop-in filter if I get the AP will the tune jive with my already installed parts ?? Or do I have to buy the tuneable AP ?? 
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Question is did you modify the reduction piece of the magnaflow cat back to match up to the 3 inch test pipe. If not is there excessive turbulance with the flow.