1G, 2G ... it's typically not applicable to test pipes. While the stock exhaust configuration is clearly different, once you start modifying the exhaust there are just so many variables.
The best thing to do in my opinion is order a slip fit pipe based on your diameter and have either an exhaust guy make it fit (some one you know preferably... some shops get a little pissy about the lack of a cat con, to say the least) or fit it in yourself, cutting the dp side and or cat-back side as needed to make it all fit.
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