UNLOCK MORE POWER,
SOUND, and STYLE
Mishimoto air intakes provide superior airflow over stock and gives your Civic Si more power and aggressive tone under acceleration.
UNLEASH THE
FULL POTENTIAL
OF YOUR CIVIC Si
Enhance your Honda Civic Si’s performance and cooling capabilities with Mishimoto. Discover our selection of Honda Civic Si performance parts, including cold air intake systems, intercooler pipe kits, and silicone radiator hoses. When every component matters, performance upgrades from Mishimoto help your Honda Civic Si run cooler, breathe more freely, and respond faster in any condition to push your Civic Si to the limits. Whether you’re chasing lap times or sharpening daily drive dynamics, these upgrades address the real limits in the stock setup.
UNLOCK MORE POWER,
Engineered for maximum efficiency and durability.
Mishimoto radiators for your Civic Si are precision TIG-welded and provide both enhanced durability and cooling efficiency to keep your engine cool in the most demanding of conditions.
Greater fin
surface area
for improved heat transfer
Increase in
core volume
for improved cooling efficiency
MORE Honda Civic Si performance parts
Silicone Hose Kit, Black, fits Honda Civic SI 2002-2005£88.80 (Incl. VAT)
Silicone Hose Kit, Red, fits Honda Civic SI 2002-2005Sale Price £62.16 (Incl. VAT) Regular Price £88.80 (Incl. VAT)
Silicone Coolant Hose Kit, Red, fits Honda Civic Si 2012-2015£111.60 (Incl. VAT)
Performance Aluminium Fan Shroud Kit, fits Honda Civic SI 2006-2011Sale Price £127.44 (Incl. VAT) Regular Price £212.40 (Incl. VAT)
SI Performance Aluminium Radiator, fits Honda Civic 2006-2011Sale Price £167.76 (Incl. VAT) Regular Price £279.60 (Incl. VAT)
Silicone Radiator Hose Kit, Black, fits Honda Civic Si 2006-2011£88.80 (Incl. VAT)
Silicone Induction Hose, Blue, fits Honda Civic Si 2012-2015£144.00 (Incl. VAT)
Silicone Induction Hose, Black, fits Honda Civic Si 2006-2011£133.20 (Incl. VAT)
Silicone Induction Hose, Blue, fits Honda Civic Si 2006-2011£133.20 (Incl. VAT)
SI Performance Aluminium Radiator, fits Honda Civic 2002-2005£297.60 (Incl. VAT)
Silicone Coolant Hose Kit, Black, fits Honda Civic Si 2012-2015£111.60 (Incl. VAT)
Silicone Induction Hose, Red, fits Honda Civic Si 2012-2015£144.00 (Incl. VAT)
Performance Aluminum Radiator, fits Honda Civic Si 2012-2015Sale Price £223.92 (Incl. VAT) Regular Price £373.20 (Incl. VAT)
Mishimoto Performance Intercoolers and Pipe Kits.
Built with cast aluminum end tanks, a robust bar-and-plate core, and high-flow aluminum piping, our Civic Si kits deliver more power and keep intake air temperatures low during demanding drives.
Increase in
core volume
for superior cooling capacity
Cast aluminum
end tanks
for serious dependability
Improves
airflow and
lowers intake air temps
civic si videos
How To Install A Performance Air Intake for the 2022+ Honda Civic Si
In this detailed tutorial, we will walk you through each essential step of the performance air intake installation process and give insightful tips and tricks. Whether you're a seasoned...
civic si blogs
Cold Front - Performance Intercooler Kit for the 2022+ Honda Civic Si
When extracting every bit of performance from an eleventh-generation Honda Civic Si, managing intake air temperatures becomes essential for consistent power...
BAFFLED OIL CATCH CANS
FOR YOUR CivIc SI
Mishimoto Baffled Oil Catch Cans protect critical systems from oil blow-by for more consistent performance over time.
Improved heat and pressure tolerance.
Mishimoto Honda Civic Si radiator hoses are made from a combination of high-grade silicone and heat-resistant embedded fibers for a high-quality replacement kit for your OEM rubber hoses.
Durable silicone
construction
that lasts and in 3 colors
that fit your style
High-quality
worm-gear clamps
provided for ease
of installation
your CIVIC + team mishi
Lifetime Warranty
Designed and engineered in our state-of-the-art facility located in Garnet Valley, PA, all Mishimoto products are covered with the Mishimoto Lifetime Warranty with accident protection.
Frequently Asked Questions
The 2022+ Civic Si's L15CA 1.5T heat-soaks under hard driving because the stock intercooler's tube-and-fin core with crimped plastic end tanks runs out of heat rejection capacity on consecutive pulls — and Mishimoto's performance intercooler for this platform resolves that directly. The factory core is a 7-row tube-and-fin design sized for the stock 200 hp output, not sustained spirited driving, so charge air temps climb on back-to-back hard pulls and the ECU pulls timing as a protective measure, causing inconsistent power run to run. Mishimoto's replacement uses a bar-and-plate core with cast aluminum end tanks for 146% more core volume than stock, dropping average outlet temps 18.1°F below stock and delaying ECU timing intervention to keep power delivery consistent. It's plug-and-play with no cutting required and fully compatible with stock ducting, and the core works with stock piping now — the aluminum piping kit can be added later for 103% more hot-side and 75% more cold-side flow area.
The L15CA's direct-injection system doesn't wash the intake valves with fuel the way a port-injected engine does — which means oil vapor from the PCV system deposits on the valves unopposed, and Mishimoto's baffled oil catch can stops that before it becomes a carbon buildup problem. The root cause is the PCV system recirculating crankcase blow-by gases carrying oil vapor back into the intake on every drive cycle; because the L15CA's injectors fire directly into the cylinder and bypass the intake valves, that oil vapor has nothing to wash it off between service intervals. Left unchecked, the vapor also lowers the octane of the incoming fuel-air charge, raising the risk of preignition and knock, and the carbon deposits it leaves reduce airflow and combustion efficiency over time — accumulating faster under spirited driving until an invasive intake valve and port cleaning service is needed, typically a couple thousand dollars and required every 60k+ miles minimum (YMMV). Mishimoto's catch can intercepts that oil vapor on the PCV side before it reaches the intake, using a 50-micron bronze filter and internal air diverter baffle housed in a billet 6061 aluminum can with a direct-fit steel powder-coated bracket and pre-formed application-specific hoses. Install takes thirty minutes or less with all hardware included, and the can is fully washable — no replacement filter elements needed.
Mishimoto's performance air intake for the 2022+ Civic Si delivers dyno-proven gains and sharper throttle response by replacing the factory enclosed airbox and resonator with a high-flow system that lets the L15CA turbo engine breathe freely. The intake cuts intake restriction by 50.7% compared to the stock airbox and resonator, translating to up to 4.9 hp and 4.7 lb-ft of torque on the factory calibration. The filter draws from the same underhood location as the factory airbox, so intake temps stay consistent during spirited driving, and the reduced restriction sharpens turbo spool and improves pedal feel — noticeable on the street before peak power numbers come into play. The sharper induction tone under boost is a direct result of better airflow, not an engineered sound tube. Installation is plug-and-play with no cutting or modifications to the factory system, and the injection-molded glass fiber-reinforced nylon MAF housing integrates directly with the stock sensors.
Mishimoto's performance aluminum radiator for the 2022+ Civic 1.5T replaces the factory plastic-tank unit with a fully TIG-welded aluminum construction that adds significant heat rejection capacity for back-road and track use. Its 40mm thick strutted-tube core resists the chassis flex that the factory radiator can't handle during hard driving, and it delivers a 44% increase in core volume, 53% more external fin area, and 85% more internal tube area than stock — all of which add up to more surface area dissipating heat per pass and improved coolant flow. It installs plug-and-play without bumper removal and is compatible with both stock hoses and the Mishimoto silicone hose kit, and it includes a magnetic drain plug that captures metallic debris circulating in the coolant. The net result is that it removes the thermal ceiling the factory radiator imposes before the rest of the cooling system reaches its limit.
The factory intercooler piping on the 2022+ Civic Si restricts airflow through sharp bends and narrow passages — Mishimoto's aluminum piping kit addresses the entire charge air path, not just the core. It increases hot-side flow area by 103% and cold-side flow area by 75% over stock, and removes the OEM resonator for a sharper induction sound under boost. A pre-drilled 1/8-inch NPT port on the cold-side pipe supports auxiliary gauges, sensors, or water/methanol injection, and DuraCore five-ply silicone couplers rated for sustained boost pressure replace the factory rubber. The modular path lets you install the intercooler core first with stock piping for immediate heat-soak gains, then add the piping kit later for maximum airflow.
Three Mishimoto upgrades cover the highest-return improvements for a 2022+ Civic Si driven hard on the street — and all three install without cutting or fabrication. The performance intercooler drops average charge air temps 18.1°F below stock and maintains consistent power across consecutive hard runs, up to 8.1 hp and 8.1 lb-ft of torque with the full kit. The baffled oil catch can prevents oil vapor from depositing on the L15CA's direct-injection intake valves, protecting long-term engine condition at any level of use starting from the first install. The performance air intake adds a 50.7% restriction reduction and up to 4.9 hp and 4.7 lb-ft on the factory calibration, along with sharper throttle response and improved induction sound. The intercooler is modular — start with the core and add the piping kit later, since the core stays in place and nothing is thrown away — and all three are plug-and-play with fitment confirmed for the 2022+ Civic Si at mishimoto.com/civic-si.
Why Mishimoto?
Mishimoto, the world leader in performance cooling products, was created for automotive enthusiasts by automotive enthusiasts. Established in 2005, we have two decades of experience in working toward our goal of providing superior cooling system upgrades.
FITMENT
All Mishimoto products are carefully designed for a clean, direct-stock fit for an easy installation
QUALITY
All our products are rigorously tested to ensure the quality of our data. Visit our Engineering Blog for more information
APPEARANCE
With an array of product finishes and colors that will add style, your engine will look just as great as it performs
WARRANTY
Every product is covered by our Lifetime Warranty which includes accident protection for cars and trucks