ISR Performance Single GT exhaust is a y-pipe back exhaust system made of mandrel bent stainless steel to ensure the highest reliability and quality. This Single exhaust gives you all the advantages of unrestricted flow to maximum horsepower while retaining a deep and aggressive exhaust tone. This single GT exhaust is the perfect combination for both naturally aspirated and forced induction applications. Fitment Information Infiniti G37 Sedan RWD or AWD (2009, 2010, 2011, 2012, 2013) Emissions Compliance This is a catback exhaust and does not alter, replace, or modify any emissions equipment. Specs & Features Provides a deep and aggressive exhaust tone Lighter then factory exhaust  Precision TIG welded Stainless Steel Brushed Stainless finish  Polished tip and muffler 3" exhaust with 4.5'' muffler tip  ISR Performance Exhaust systems are made to perform.  Each exhaust is built to provide the best sound, best performance and give your car a clean, modified look. ISR Exhausts are designed to be a direct bolt on and require no modifications to install.