Dynomax Performance Exhaust 2005-2009 Stainless Steel Cat-Back Exhaust System for the 4.6 and 5.4L Made in the USA! 90 DAY RISK FREE TRIAL OFFER Who else want you to be 100% happy with your investment!?!? Easy bolt on. Gain 8HP and 9TQ with this bolt on kit. 2.5" Mandrel bent exhaust tubing.