HPI Silicone Radiator Hose Kit — Impreza GDB

The HPI Silicone Radiator Hose Kit — Impreza GDB — a direct-replacement silicone radiator hose kit, three-ply, built for Impreza GDB owners who want a hose that doesn’t go soft at the vulcanised seams.

Brand: HPI
Product Name: HPI Silicone Radiator Hose Kit — Impreza GDB
Fitment: Impreza GDB
Part Number: HPSRH-GDB
Material: Silicone 3-ply (4.5–5mm wall)
Includes: Hose set + #24 clamps per hose, 2 pcs each

Note: HPI do not provide fitment advice; please verify against your car and work with a qualified technician.

Material: Silicone 3-ply, 4.5–5mm wall. HPI’s silicone hoses are a quiet favourite for Japanese tuners: they resist pressure spikes, don’t collapse under vacuum, and look the part in a tidy engine bay. The Impreza GDB kit replaces every rubber radiator hose from the factory, with hose clamps included so the install is a complete afternoon rather than a parts chase.

Features:

• Three-Ply Silicone: Resists heat cycling and pressure fatigue far better than OEM EPDM rubber.
• Direct Replacement: Mandrel-formed to the exact shape of the Impreza GDB factory hoses.
• Clamps Included: Two #24 hose clamps per hose, so the install is complete out of the box.
• Made in Japan: HPI is a Japanese motorsport-parts specialist — these are built in-house, not sourced.
• Workshop Install: Should be fitted by a qualified technician familiar with cooling-system bleed procedures.

For Impreza GDB owners refreshing the cooling system properly rather than reusing 25-year-old rubber.