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The difference is fairly obvious. The Bassani piece has only one thing in mind and that's performance. The stock shorty purportedly features 1.5-inch diameter tubes, but they are pinched and crimped all over the place, consequently impeding flow. The stock O2 sensor usually mounts about 5-inches or so past where the mid-pipe connects to the header, so comparing the Bassani header, you can see that you'll have to do some re-routing.