What type of coolant should I use with this Koyo radiator?

For optimal performance and to prevent corrosion, it's recommended to use a high-quality coolant specifically formulated for Subaru vehicles. Always refer to your vehicle's owner's manual for the exact coolant type and capacity.

Does this radiator come with a radiator cap?

This Koyo radiator (VH091672) includes the filler neck but does not come with a separate radiator cap. You will need to reuse your vehicle's original cap or purchase a new one if needed.

Is this radiator suitable for track use?

Yes, Koyo radiators are known for their robust construction and improved cooling capabilities. The high-density core helps manage engine temperatures during demanding driving conditions like track use or spirited driving.

2003-2007 Subaru Impreza Radiator

Name: Koyo 03-07 Subaru Impreza WRX/STI (MT / w/ Filler Neck) Radiator
Brand: Koyo
SKU: koyo-koyo-03-07-subaru-impreza-wrx-sti-mt-w-filler-neck-radiator-t14-4320941
Price: 430.57 USD
Availability: InStock

Koyo 03-07 Subaru Impreza WRX/STI (MT / w/ Filler Neck) Radiator

$430.57

In Stock

Fits 2003-2007 Subaru Impreza WRX/STI (MT / w/ Filler Neck). Koyo radiator for improved cooling.

Key Features

Fits 2003-2007 Subaru Impreza WRX and STI models with manual transmission and factory filler neck.
Koyo is a well-known brand for durable cooling system parts.
Features a high-density core for improved heat dissipation.
Designed as a direct replacement for straightforward installation.
Includes the filler neck for a complete cooling system setup.

Secure CheckoutFast Shipping631-982-0042

Product Details

This is a Koyo radiator specifically for your 2003-2007 Subaru Impreza WRX or STI with a manual transmission and the factory filler neck. If your Impreza's original radiator is leaking or not keeping up with engine heat, especially during spirited driving or track use, this is a solid replacement option.

Koyo is well-known for making durable cooling components. This radiator is built with a high-density core, which means it has more cooling fins packed into the same space compared to a stock radiator. More fins mean more surface area to dissipate heat, helping to keep your engine temperatures in check even under demanding conditions. It's designed to fit like the original, making installation straightforward, and it includes the necessary filler neck for a complete setup.

When installing a new radiator, it's a good time to also check your coolant hoses and thermostat. Make sure you have fresh coolant that's appropriate for your Subaru to get the best performance from this new Koyo radiator.