Backpressure optimizing exhaust inserts.

• Vortex design increases back pressure, improving torque and horsepower
• High-temperature stainless steel cones have fully radiused edges that smooths out the power curve for improved engine response, especially low-end torque
• Generates correct levels of backpressure for increased horsepower
• Fit most stock and aftermarket exhaust systems; fit 1-3/4"-2" i.d. exhaust pipes
• Made in the USA