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Though not exactly what we used, the standard kit will bolt or weld on and give the stock 4.0L V-6 a much healthier sound. Dyno tests have shown a 5 percent torque gain, plus both the standard FJ Cruiser kit and the custom system we used on our Ultimate FJ contains 2 1/2-inch 16-gauge aluminized steel pipes with a 50-series SUV muffler and a 4-inch stainless steel exhaust tip.