Koyorad Performance Radiator for Mazda RX-8 1.3L MT 2004-2008
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Description
Koyo Performance Radiator – Mazda RX-8 SE3P 1.3L Rotary MT 2003–2008
Application: Mazda RX-8 | SE3P (4D Coupe) | 13B-MSP 1.3L Aspirated Rotary RWD | Manual Transmission Only
Part Number: V2695 / KV061615R
The RX-8's 13B-MSP Renesis rotary engine is a unique piece of engineering — high-revving, naturally aspirated, and with a thermal profile unlike any piston engine. The compact engine bay and specific clearance constraints mean a thicker core radiator simply isn't an option, which is exactly where Koyorad's 36mm V-Core Series steps in.
Engineered for applications where engine size or configuration limits core thickness, the V-Core 36mm delivers genuine performance cooling in a package that fits correctly and installs cleanly. It's designed for both circuit and daily use — keeping coolant temperatures stable whether you're chasing lap times or commuting. A direct bolt-in replacement that retains all OEM fan shroud mounts and stock hose connections, with no engine modifications required.
Every Koyorad All Aluminium Racing Radiator is Nocolok furnace brazed, precision TIG welded by hand, and triple pressure tested before leaving the factory.
Why Koyorad?
- Precise Tube & Fin Alignment — Strict quality control ensures optimal coolant flow and maximum heat transfer efficiency across the entire core.
- Nocolok Furnace Brazing — All tubes, fins, headers, and brackets are bonded in a state-of-the-art Nocolok furnace, creating a structure that resists vibration, road debris, and the elements.
- Billet Filler Neck — Precision-machined billet filler necks are fitted to every unit for superior strength, durability, and a reliable seal.
- OE-Specific Mounting — Application-specific mounting points for fan shrouds, inlet/outlet hoses, and top/bottom pins ensure a pain-free, no-modification install.
- Hand-Crafted Heliarc Welds — Each radiator is individually Heliarc welded by hand, creating the strongest possible aluminium-to-aluminium bond across all components.
Specifications
| Part Number | V2695 / KV061615R |
| Core Type | V-Core |
| Core Thickness | 36mm |
| Core Dimensions (H × W) | 360 × 643/667mm |
| Tube Pitch | 43/43 × 669mm |
| Inlet Diameter | Ø35mm (top) |
| Outlet Diameter | Ø35mm (bottom) / Ø12mm (overflow) |
| Construction | All Aluminium, Nocolok Brazed, Heliarc Welded |
| Transmission | Manual (MT) Only |
| Fan Shroud | Retains OEM mounts |
| Hoses | Compatible with stock radiator hoses |
| Fitment | Direct bolt-in, no modifications required |
Cross Reference
| Koyorad | V2695 / KV061615R |
| Mazda OEM | N3H1 15 200C |
Fitment
| Year | Make | Model | Chassis | Submodel |
|---|---|---|---|---|
| 2003–2008 | Mazda | RX-8 | SE3P (4D Coupe) | Base – 13B-MSP 1.3L Aspirated Rotary RWD (141kW) |
| 2003–2008 | Mazda | RX-8 | SE3P (4D Coupe) | Base – 13B-MSP 1.3L Aspirated Rotary RWD (177kW) |
Sold individually. Manual transmission fitment only. Lead times may apply — contact us at iilumolab for availability and shipping estimates.
iilumolab is an Authorised Australian Distributor of Koyorad Performance Radiators.
Shop with confidence — all Koyorad products sold through iilumolab are genuine, backed by manufacturer support, and shipped from Australia.
If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.
Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.
Note
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.