For Integra/Civic Si/Del Sol/CR-V/Prelude Top Feed High Flow Fuel Injector Rail Kit (Red) - B16-20 EK EM DC Supplies Additional Fuel Needed for High Boost/ Performance Engines Direct Bolt-On Replacement of OEM Fuel Rails 5/8" Fuel Bore for Larger Fuel Flow; Pre-Taped Ends Allows -6 And -8 Fittings Compatible with Stock Fuel Pressure Regulators or Adjustable Fuel Pressure Regulators 1/8th NTP Available For Nitrous Systems or Fuel Pressure Gauge; Fits 10.5mm - 11mm Top Feed Injectors