Acuity Super Reverse-Flow Silicone Radiator Hose Kit | 23+ Civic 1.5T & Si, 23+ Integra A-Spec

Fits:

• 2022+ Honda Civic 1.5T (Hatch FL1, Sedan FE1)
• 2022+ Honda Civic Si (Sedan FE1)
• 2023+ Acura Integra Base/A-Spec (Hatch DE4)

Set includes 2 silicone radiator hoses and 4 German-style hose clamps (formed threads, rolled edges to prevent cutting silicone hoses). Gains are largest on cars with supporting mods like hood venting or an upgraded radiator; stock cars see a smaller but still real reduction.

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ACUiTY developed these hoses as part of a project with Honda Racing Corporation to help their race cars run cooler. The core idea is simple: reverse the water flow direction through the radiator, and the same cooling pack used across the 1.5T Civic, Civic Si, and Integra Base/A-Spec rejects more heat as a result.

In the stock configuration, the coolant exiting the radiator ends up close in temperature to the hot air exiting the intercooler at the bottom of the radiator, effectively neutering the lower half's cooling capacity in hot conditions. Reversing the flow puts the hottest coolant where the hottest air already is, and the coolest coolant where the coolest incoming air enters through the upper grille — aligning the radiator's thermal gradient with the airflow's thermal gradient for meaningfully better heat rejection.

Features

• Reverses radiator water flow direction for improved heat rejection, developed alongside HRC
• Water temps reduced by up to 3.6°F (2°C) in hot conditions on cars with hood venting and an upgraded radiator
• Approximately 1°F (0.6°C) reduction on stock cars in hot conditions
• Polyester-reinforced silicone construction rated up to 100°F higher than stock EPDM rubber hoses
• Includes German-style hose clamps designed to prevent cutting damage to silicone hoses
• Set includes 2 silicone radiator hoses and 4 hose clamps