PRODUCT DETAILS
Mishimoto Aluminum Radiator - 2022-2026 Civic Si & Integra 1.5T
The factory radiator on the 1.5T Civic Si and Integra is sized for a stock car driven normally, and it runs out of capacity the moment you tune it, track it, or push it on a hot day. This Mishimoto all-aluminum radiator replaces it with a core that holds 44% more coolant volume and 85% more internal tube area, a dramatic increase in how much heat the system can shed. It's a direct, plug-and-play fit with no bumper removal, and it's backed for life.
Why The Factory Radiator Runs Out
Worth understanding, because it's the reason to upgrade.
Your radiator's job is to pull heat out of the coolant and dump it into the air. A stock radiator has a fixed capacity to do that, and on a tuned or hard-driven 1.5T, you're generating more heat than it was designed to handle. When it can't keep up, coolant temperatures climb, and rising coolant temps lead the ECU to pull timing to protect the engine, which costs you power exactly when you're asking for it.
On a track day, in traffic on a hot day, or on a tuned car making more than stock, that's when the factory radiator becomes the limit. A larger, more efficient radiator moves that ceiling up so your temps stay in check when you're working the car hard.
The Numbers Behind The Upgrade
These are substantial increases, not marginal ones, which is where the cooling gain comes from.
44% more core volume means significantly more coolant in the radiator at any moment, more thermal mass and more fluid being cooled. 85% more internal tube area means far more surface for heat to transfer from the coolant into the radiator. And 53% more external fin area means more surface for that heat to then transfer into the air passing through.
Together, those three increases attack heat rejection at every stage, more coolant, more internal transfer surface, more external dissipation surface. That's why this makes a real difference under load rather than a token one.
Built Tough, Resists Chassis Flex
The construction is proper performance-radiator build.
It's all-aluminum with precision TIG-welded end tanks, lighter and more durable than the factory plastic-tank radiator, which is a common failure point as those plastic tanks age and crack. The core is a 40mm thick strutted tube design, and the strutting resists the chassis flex that a radiator sees in hard driving, keeping the core from fatiguing where a thinner, unstrutted core would stress over time.
Aluminum also sheds heat better than the mixed materials of a factory unit, so the construction itself contributes to the cooling, not just the size.
The Details That Protect Your System
Two included extras that matter.
A magnetic drain plug captures metallic debris circulating in your cooling system, the tiny metal particles that come from normal wear, so they collect at the plug instead of circulating through your pump and engine. It's a small thing that genuinely protects the system over time.
A 1.3 bar high-pressure radiator cap is included, which raises the system's boiling point, higher pressure means coolant can run hotter before it boils, giving you more margin before the system vents. Both are the kind of detail that separates a complete performance radiator from just a bigger core.
Direct Fit, No Bumper Removal
Straightforward to install.
This is a plug-and-play direct fit that mounts in the factory location without removing the bumper, which is a real convenience, many radiator swaps require pulling the front end. It works with your stock coolant hoses or the matching Mishimoto silicone hose kit, and it reuses your fan shroud and AC condenser with the included hardware kit.
No fabrication, no cutting, no front-end teardown, it goes in where the factory radiator came out.
Fitment
2022-2026 Honda Civic Si (1.5T)
2023-2026 Acura Integra Base and A-Spec (1.5T)
Also fits 2.0L (L15/K20C) applications across the FE/FL chassis. Direct fit, no bumper removal required.
Who Should Grab This
This is for the Civic Si or Integra owner who tracks the car, tunes it, or has watched coolant temps climb when pushing it, and wants real cooling headroom from an all-aluminum upgrade. 44% more volume, 85% more internal tube area, TIG-welded aluminum that won't crack like the plastic factory tanks, plus a magnetic drain plug and high-pressure cap. Direct fit, no bumper removal, lifetime warranty. Keep your temps in check and your power on the table.
Fits: 2022-2026 Civic Si and 2023-2026 Integra Base/A-Spec (1.5T), plus related FE/FL chassis applications. Construction: all-aluminum, TIG-welded end tanks, 40mm strutted tube core. Capacity: 44% more core volume, 85% more internal tube area, 53% more external fin area vs stock. Includes: magnetic drain plug, 1.3 bar high-pressure cap, fan shroud/AC condenser hardware. Install: direct fit, no bumper removal; works with stock or Mishimoto silicone hoses. Warranty: Mishimoto lifetime.
2023-2026 Acura Integra Base/ASpec
2022-2026 Honda Civic Si/1.5T