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Pipes are pipes. Earlier revisions had fitment issues, but they seem to be fixed as of now. They are the entry level N54 downpipes, so obviously won't have the quality AR/AA do, but they still get the job done, that is deleting the biggest restriction in the exhaust system. The only con with the pipes I see, is that they are 2.5" pipes all the way through. This means if you are planning to run boost in upwards of 17psi you are leaving 4-6whp on the table. Minor, but still a consideration.
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