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2. A quick comparison of the Borla Performance Industries' Cat-Back muffler to the stock unit reveals the Borla unit to be roughly 6 inches shorter in length, meaning that with less interior baffles than the stock muffler, spent exhaust fumes will be directed more quickly out to the rear of the SUV. Overall, for the stock 4.3L V-6, total power gains should be anywhere from 6 to 8 percent better than stock. In addition, the new Borla system offers a deeper exhaust tone as well as a 1-to-3-mpg increase in fuel economy.