Mishimoto 12-15 Honda Civic Si Performance Radiator
Price excluding customs duties and tax.
Upgrade the cooling system of your 2012-2015 Honda Civic Si with this Mishimoto Performance Aluminum Radiator, built to manage the sustained thermal output of a high-revving K-series engine on the street and the track. All-aluminum construction with precision TIG-welded end tanks outlasts the factory plastic-tanked unit prone to cracking under heat cycling and repeated high-rpm use. A 63% increase in core volume over the OEM radiator delivers greater surface area and thermal capacity, keeping coolant temperatures stable during back-to-back pulls, spirited street sessions, and weekend track days where the stock radiator starts to fall behind.----Designed as a direct-fit replacement for the 2012-2015 Honda Civic Si, this radiator drops in without cutting, fabricating, or modifications, and works seamlessly with all stock hoses and components without alteration. The included high-pressure radiator cap maintains optimal system pressure from the first drive, extracting the full benefit of the upgraded core. The Mishimoto Magnetic Drain Plug catches ferrous metallic debris before it circulates through the cooling system, protecting your K-series engine internals and extending service life beyond what the factory setup allows.----Don't wait for your stock radiator to crack and leave you sidelined. Whether you daily drive your Civic Si, push it hard on weekend canyon runs, or are building toward a higher-output K-series setup, this aluminum radiator handles the sustained thermal demands your factory unit was never built for. Proactive cooling upgrades protect your engine investment - and this one is built to outlast it. Backed by the Mishimoto Lifetime Warranty, this Performance Aluminum Radiator is the last cooling upgrade your 2012-2015 Honda Civic Si will ever need.
- Built for the high-rev demands of the Civic Si K-series — the oversized aluminum core absorbs sustained thermal output during back-to-back pulls, spirited street driving, and track sessions where the stock radiator begins to fall behind.
- Magnetic drain plug removes ferrous debris before it circulates — catches metallic particles from the cooling system to protect K-series engine internals and extend service life beyond the stock interval.
- All-aluminum construction, no plastic to crack — full aluminum end tanks joined by precision TIG-welds replace the factory components that fail under heat cycling and sustained high-rpm use.
- 63% more core volume over stock — the enlarged core delivers greater surface area and thermal capacity than the factory unit, running measurably cooler when the K-series is pushed hardest.
- Drops in without modification — confirmed direct fit for the 2012-2015 Honda Civic Si, compatible with all stock hoses and components — no cutting, fabricating, or adapter work required.
- Included high-pressure radiator cap maintains optimal system pressure — delivers enhanced cooling performance from the first drive without sourcing additional components.
- Own it for life — backed by Mishimoto's Lifetime Warranty, your investment is protected long after install day.
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2012-2015 | Honda | Civic | Si |
We understand how important it is for you to receive your products in a timely and efficient manner. Therefore, we have outlined our shipping policy below to provide clarity and transparency:
1. Order Processing Time:
- We strive to process all orders within 1-3 business days after receiving payment confirmation.
- Please note that processing time may be slightly longer during peak seasons and holidays.
2. Shipping Methods and Carriers:
- We work with a variety of trusted shipping carriers to ensure reliable delivery, including but not limited to UPS, FedEx and DHL.
- The specific carrier and shipping method for your order will depend on various factors such as destination, package weight, and shipping speed.
3. Shipping Time:
- Once your order has been processed and shipped, the estimated delivery time will depend on the destination and shipping method chosen.
- On average, our customers receive their orders within 7-14 business days.
- Please note that some remote locations or international destinations may require longer delivery times.
4. Tracking Information:
- To keep you informed about the progress of your order, we will provide tracking information as soon as it becomes available.
- You can track your shipment using the provided tracking number on our website or directly on the carrier's website.
5. Shipping Fees:
- Shipping fees will be calculated during the checkout process based on the weight of the package, destination, and selected shipping method.
- We may offer free shipping promotions from time to time, so make sure to check our website or subscribe to our newsletter for any ongoing offers.
- We are proud to offer international shipping to many countries worldwide.
- Please note that international shipments may be subject to customs duties, taxes, or import fees imposed by the destination country. These charges are the responsibility of the customer and may vary depending on the customs policies of the respective country.
6. Order Tracking and Customer Support:
- If you have any questions or concerns regarding your order, our customer support team is here to help.
- You can contact us through our website or email, and we will respond to your inquiries as soon as possible.
Please keep in mind that this shipping policy is subject to change without prior notice. We recommend reviewing our policy periodically for any updates.