Pro Circuit has numerous championship victories to their credit in the motorcycle and ATV industry because of their amazing performance, durability and style. The Pro Circuit T-4R GP Complete Exhaust is the same performance exhaust that the Pro Circuit factory race team uses, as well as factory Suzuki and Kawasaki, but made from stainless steel for maximum value. Pro Circuit developed the T-4R GP complete exhaust system to deliver improved throttle response and increase horsepower throughout the RPM range. As the T-4R GP Complete Exhaust system has been designed and constructed for race performance, it does not include a spark arrestor. Top-of-the-line performance and power. T-4R features stainless steel construction. Tapered headpipe for better overall power from bottom to top end. Specially designed mounting bracket for increased strength and durability.