For Honda Civic Si Full Aluminum 2-Row Racing Radiator - FD2 KA20 Engine Made of High Quality Full T-6061 Aluminum Construction Stronger & Higher Capacity for Coolant than Stock Units / Light Weight Direct Bolt-On OEM Fitment or Replacement High Performance 2-Row Racing Design / Improves Cooling by 35 - 45% Temp. Overall Dimension: 27 x 18.25 x 2 / Core Dimension: 26.5 x 14.75 x 1.75 / Inlet: 1.25" / Outlet: 1.25" Application: Please Check Part Finder On Top of The Page (Professional Installer is Highly Recommended No Instruction Included)