Does the Koyo Radiator require a different than OEM Radiator Cap? My Oem is fitting way too tight!

 

Yes, you needed a different cap and your stock one doesnt fit right with the Koyo rad. The ones off 88-91 Civic, 90-93 Integra will work. If you are planning to get an aftermarket cap, Spoon F cap or Tabata will work as well.

 

Koyo also makes a cap for their radiator. Around $20-30 dollars.