Downpipe and the Mishimoto 2015+ Ford Mustang EcoBoost Cat-Back Exhaust? This 3.0" adapter eliminates the restrictive 2.25" center section that is the result of joining some aftermarket downpipes and cat-backs. The Mishimoto 2015+ Ford Mustang EcoBoost Exhaust Adapter is made a 304 Stainless Steel that will not rust in harsh climates and installs in under 30 minutes. This adapter perfectly complements the V-band flange on the Mishimoto downpipe and the 3 band clamp on the Mishimoto cat-back exhaust. And like all Mishimoto 2015+ Ford Mustang EcoBoost parts, this Adapter comes with the Mishimoto Lifetime Warranty. Looking for a smooth transition between the Mishimoto 2015+ Ford Mustang EcoBoost Downpipe and the Mishimoto 2015+ Ford Mustang EcoBoost Cat-Back Exhaust? This 3.0" adapter eliminates the restrictive 2.25" center section that is the result of joining some aftermarket downpipes and cat-backs. The Mishimoto 2015+ Ford Mustang EcoBoost Exhaust Adapter is made a 304 Stainless Steel that will not rust in harsh climates and installs in under 30 minutes. This adapter perfectly complements the V-band flange on the Mishimoto downpipe and the 3 band clamp on the Mishimoto cat-back exhaust. And like all Mishimoto 2015+ Ford Mustang EcoBoost parts, this Adapter comes with the Mishimoto Lifetime Warranty.