【Construction】- Made of High Quality Full T-6061 Aluminum Construction Core 【Feature】- OEM Replacement for the Stock Unit. Lightweight Direct Bolt-On OEM Fitment or Replacement 【High Performance】- Improves Cooling Efficiency, Make Heat Dissipation More Efficient to Prevent Premature Engine Failure 【Specification】- Core Dimensions: 18-13/16" W X 13-3/4" H X 5/8" D. Inlet , Outlet Diameter: 1-1/4" , 1-1/4" 【Installation】- Professional Installation is Highly Recommended. No Instruction Included