The evolution continues with new GReddy EVOlution GT exhaust line. Improved and refined, this latest generation of Evo exhaust incorporates our new high flow straight-through internals and limited lifetime warranty. It also retains the benefits of the compact and efficient, offset-tip design of the previous Evo s muffler. Each EVOlution GT is carefully constructed from precision TIG welded, high quality 304 stainless-steel. High flow with a deep rich exhaust note is what the GReddy Evo line is know for.