21006 Carbon Fiber Muffler With Double Adjustable Sound - Torque	21007 Carbon Fiber Muffler with Adjustable Sound-Torque	21017 Luxury Carbon Fiber Muffler with Adjustable Sound - Torque
21011 Carbon Fiber Muffler with Adjustable Sound and Torque	22014 Stainless Steel Muffler with Adjustable Sound and Torque	22016 Luxury Stainless Steel Muffler with Adjustable Sound -Torque and Slanted Tip
22018 Stainless Steel Muffler with Adjustable Sound -Torque	Sound Killer and torque riser if stop by police , reduce your muffler's sound and save a ticket. Also you can adjust your car's torque.

Z Speed Racing Universal Stainless Steel or Real Carbon mufflers will increase your engines response and improve gas mileage. The free-floss design reduces backpressure 30-40%, an adjustment based on knowledge gained from real racjing experience. The result is a 3-5% horsepower gain that is not measurable on the dynamometer but noticeable in real driving as well. The large tips not only gives our car a custom look, but also a real deep aggressive sound! The patterned removable inside funnel it adjusts the sound and also makes a difference in torque enhancement.