Kooks 15-20 Ford F150 2.7/3.5/5.0L 3in Dual Cat-Back Rear Exit Exhaust w/Polished TipsKooks 15 20 Ford F150 2. 7 3. 5 5. 0L 3in Dual Cat Back Rear Exit Exhaust w Polished Tips Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many