The ACT XACT Flywheel for the 2011, 2012, 2013, 2014, 2015, 2016, and 2017 Ford Mustang 3.7L V6 is a Streetlite flywheel, which is considerably lighter than stock and is the most durable flywheel offered by ACT. Materials are properly distributed for maximum strength, decreased inertia, good heat tolerance and rigidity. ACT's Streetlite flywheels are preferred for street or drag racing. ACT flywheels are serviceable and can be resurfaced with no need to purchase additional parts.