Kinetic Performance Double-Tip Exhaust for Kia Optima Sonically engineered to be drone free. This means you wont hear any unusual humming at high speeds, or experience rattling in the cockpit. Manufactured from 409 stainless, in the U.S. Straight thru design delivers noticeable increase in engine efficiency, horsepower and torque. Its throaty, more aggressive sound will turn heads, but wont wake up the neighbors. Custom designed, quad tip (two tips per side) exhaust developed to improve performance on 2011 and 2012 Kia Optima Turbo models