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I don't have numbers from dyno, but I can say you can feel the difference. I am one of the people that was throwing codes. I am in the process of doing an rma threw magnaflo. and yes they know about this issue. I don't think they want it very public though. My thought is that they bell the ends to much so it is easy to put together and the flaired end of the exhaust that bolts up to the cat has scratches running from inside to outside on the flare.This is not very good for sealing purposes. the stock pipe does not have this they are smooth.
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