Hose, Radiator Lower (Genuine) EVO9, EVO9 Wagon

Using a genuine rubber radiator hose instead of a silicone one has a few practical advantages, especially for street-driven EVOs:

1. OEM Fitment & Shape Accuracy – Genuine hoses are molded precisely to match the original bends, lengths, and diameters. Silicone hoses can sometimes require trimming or adjustments, which may affect coolant flow or cause clearance issues.

2. Thermal Expansion Compatibility – Rubber expands and contracts at a rate similar to the metal fittings it connects to, reducing stress on clamps and sealing surfaces. Silicone expands differently, which can sometimes lead to minor coolant seepage if not clamped correctly.

3. Better for Stock Clamps – OEM spring clamps work perfectly with rubber. Silicone’s smoother surface can allow clamps to slip slightly unless upgraded to high-torque or lined clamps.

4. Chemical Resistance – Rubber hoses are designed to withstand the exact coolant type specified by Mitsubishi, as well as additives, without softening or degrading prematurely. Some lower-grade silicone hoses may not be as tolerant over long periods.

5. OEM Service Life & Warranty – A genuine hose is built to meet the same durability standards as the original, often lasting 8–10 years in normal use.