Skunk2's Fine Tuning products and accessories, like its high - pressure Radiator Caps, help put the finishing touches onto your vehicle you work so hard to make perform well. Skunk2 Radiator Caps increase internal radiator pressure, which results in a higher coolant boiling point and a more efficient cooling system. Skunk2 Radiator Caps feature an open valve pressure of 1.3 kgcmthats .2kgcm higher than most OEM radiator caps. High - pressure radiator caps like Skunk2's demonstrate their effectiveness under high - load conditions on both race cars and street cars alike. Skunk2's high - pressure Radiator Cap Type A fits 88 - 91 Civics, 90 - 93 Integras, 92 - 01 Preludes, and most Mazdas, Mitsubishis, Nissans, and Subarus, as well as most aftermarket radiators.