STILLEN 508185 Stainless Steel Cat-Back Exhaust System - 10-13 Genesis Coupe V6 304 Stainless Steel Construction Polished Quad 3.5" Stainless Tips, End Pipes and Mufflers Increase of 9 HP On the Dyno Aggressive Note Under Throttle; Limited Lifetime Warranty Bolt-On Installation - No Cutting or Welding