"New" High Flow Stock Replacement Muffler. This Muffler Guarantees a 3% Minimum Gain in MPG and has a 30 Day Money Back Guarantee if you are not Satisfied. It is Heavy Gauge with a 100% Welded Construction that is Easily Installed Bolts in Place of Stock 10" Muffler. No Turbo Lag for Faster Acceleration. It has the Highest CFM Flow of Any Muffler and is as Quiet as a Stock 10" Muffler. It also works on all Engines ISX 3406E 14L Series 60 Etc.