DG Performance 00-4009 - ATV Xtreme Pipe (Nickel Plated) for Yamaha Tri-Z 250 (1985-1986 ) Extreme pipes come with Nickel plated finish for low maintainence performance DG ATV exhaust pipes have won more national championships than all competitor's pipes combined. Increased acceleration. Hand-fabricated. Extreme styling with aircraft quality. Increased horsepower and torque