The t-4 system is designed to increase performance from bottom to top, making it easier to ride faster. The stainless steel and aluminum construction offer increased strength and durability; ideal for racing and off-road riding. This system is also tunable, meaning you can remove the spark arrestor screen turning it into a race tip for closed course racing; fasten the screen back on for off-road riding. The t-4 system is perfect for riders on a budget that are not willing to compromise on performance.