BlingLights Rear Bumper Performance Aero Drag Diffusers Aluminum Race Air Opening Diversion Panels (2) Rear Bumper Air Diffusers 4mm thick, 15" (40cm) x 4" (10cm) CNC-Machined Billet t6061 Aluminum. Will Never Tarnish or Rust. All Mounting Bolts & Nuts Included Reduces Drag Which Indirectly Improves Performance & Fuel Economy Popular For Use In for Lowered Vehicles Custom Exhaust Outlets