1 This exhaust is available in either aluminized or T409 stainless steel. It is a direct bolt-on application that literally installs in about 30 minutes. Our install, which included removing the stock exhaust from our Tundra, took 27 minutes: We timed it. We chose the stainless-steel option for our truck knowing we would be seeing plenty of hard miles ahead. The thick 16-gauge T409 stainless steel will not rust and has reinforced welds at all vital points surround the system.