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So im looking to upgrade my exhaust to a 2.5" cat back system. Im not looking for performance as mush as sound since I dont want to do to much to this car just yet. My question is will I need to upgrade my OEM downpipe, that measures at just over two inches, to a 2.5" system to be able to match with the upgraded exhaust. If not, would there be any kind of issues I could expect to run into, such as fitment issues?