Next Level Performance
September 1, 2026 • 10 min read
The FL5 Honda Civic Type R and its Acura Integra Type S (DE5) sibling share the same 315–320 hp K20C1 2.0L turbo four — and the same Achilles' heel: heat. Push either car through three hot laps or a Tampa summer canyon run and oil temperatures climb past 260°F while intake air temps (IAT) balloon, pulling timing and softening the top end. The right FL5 Civic Type R and Integra Type S cooling upgrades — an oil cooler, a bigger radiator, and a larger intercooler — keep the K20C1 in its happy zone so it makes rated power lap after lap. This guide ranks the best cooling parts we stock at NLP Performance, with real fitment, part numbers, and pricing.
Our Verdict
The HKS S-Type Oil Cooler Kit is the single best reliability upgrade for a track-driven FL5 Civic Type R.
Oil temperature, not coolant, is what ends most Type R track sessions early. The HKS S-Type kit (around $1,790) adds a dedicated thermostatic core that holds oil in range on repeat pulls. Pair it with a high-capacity radiator (CSF or Mishimoto) and a larger intercooler (COBB or Wagner) once you tune. The CSF radiator and COBB intercooler are the only two parts here verified to fit both the FL5 and the DE5 Integra Type S.
Shop Our Top Pick →Why the FL5 Civic Type R and Integra Type S Need Cooling Upgrades
The FL5 and DE5 run hot because their turbocharged K20C1 packs big output into a compact, aero-tight engine bay. The Civic Type R makes 315 hp at 6,500 rpm and 310 lb-ft from 2,600–4,000 rpm; the Integra Type S bumps that to 320 hp on the same block. Honda's factory cooling is tuned for street margins, not sustained track load, so three things happen once you start driving hard: engine oil climbs toward 270°F, coolant creeps up on back-to-back laps, and the intercooler heat-soaks — raising IAT and triggering the ECU to pull ignition timing.
The fix is a layered cooling package. An oil cooler protects the engine and stabilizes power; a larger aluminum radiator holds coolant temps flat; and a bigger intercooler keeps charge-air dense so a tuned car actually uses its extra boost. At our Tampa, FL shop, where ambient temps sit in the 90s for months, we treat all three as maintenance, not just mods.
The HKS S-Type oil cooler relocates and cools engine oil through a thermostatic core.
What Should You Upgrade First: Oil Cooler, Radiator, or Intercooler?
Upgrade the oil cooler first if you track the car, the radiator first if you see coolant creep on the street, and the intercooler first if you are chasing power with a tune. Oil is the limiter for most stock FL5 and DE5 owners at track days — the factory car has no dedicated engine oil cooler, so oil temperature is the first gauge to redline. A thermostatic oil cooler kit is therefore the highest-value single upgrade for reliability. If your car stays on the street but climbs in stop-and-go heat, a high-capacity aluminum radiator is the better first move. And if you have added a COBB Stage 1 or Stage 2 tune, a larger intercooler unlocks the charge-air headroom that tune assumes.
Best FL5 Civic Type R and Integra Type S Cooling Upgrades
HKS built the S-Type kit specifically for the FL5 K20C1, with a thermostatic sandwich plate that keeps oil out of the cooler until it reaches operating temperature (roughly 180°F) — so it protects hot-lap oil temps without over-cooling on a cold Tampa morning. The dedicated core and braided lines are the most complete oil-cooling solution we stock for the car, which is why it earns our top pick for anyone doing HPDE or autocross.
Key Specifications
What We Like
- + Purpose-built for the FL5 — direct-fit hardware and lines
- + Thermostatic plate prevents over-cooling on the street
- + Addresses the K20C1's #1 track limiter: oil temperature
Things to Consider
- – Highest price of the parts here
- – FL5-only fitment; not listed for the DE5 Integra Type S
CSF's all-aluminum radiator is the coolant-side answer, and it is the one radiator here explicitly verified for both the FL5 Civic Type R and the DE5 Integra Type S. The larger aluminum core and increased coolant volume flatten temps on long pulls and stop the slow creep you feel on the factory unit in traffic. At around $849 (currently with an extra 5% off), it is the direct-fit upgrade we recommend for daily-plus-track cars.
CSF's high-capacity core is verified for both the FL5 Civic Type R and DE5 Integra Type S.
Mishimoto's aluminum radiator is the value pick on the coolant side at around $750, and it is backed by Mishimoto's Lifetime Warranty — the strongest coverage in this guide. It increases coolant capacity over stock and uses TIG-welded aluminum end tanks. Fitment is listed for the 2023+ FL5 Civic Type R; Integra Type S owners should choose the CSF unit above for verified DE5 fitment.
If you want the oil-cooling benefit at a lower entry price than the HKS kit, Mishimoto's thermostatic oil cooler kit (around $800) is the pick. The “TSL” part number denotes the thermostatic silver version, so oil bypasses the cooler until it warms up. Like the Mishimoto radiator, it carries a Lifetime Warranty. It is our value alternative to the HKS S-Type for FL5 owners who want oil control without the top-tier spend.
The carbon-fiber air duct is the finishing piece for a serious oil-cooling setup. It channels cool front-end airflow directly onto the oil cooler core, improving efficiency exactly when the car is moving fast — the moment you need it most. It is designed to pair with the HKS S-Type oil cooler, so track-focused FL5 owners often buy the two together.
FL5 and Integra Type S Cooling Comparison Chart
Here is how the cooling upgrades stack up, including the two intercooler options that address charge-air (IAT) heat soak on tuned cars. Prices update live; the COBB and CSF parts are the ones verified for both the FL5 and the DE5 Integra Type S.
| Kit | Type | Fitment | Highlight | Price |
|---|---|---|---|---|
| HKS S-Type Oil Cooler KitTop Pick | Oil cooler | FL5 | Thermostatic S-Type core | $1,790.00 |
| COBB MT Intercooler Kit | Intercooler | FL5 & DE5 | Tune-matched front mount | $1,225.00 |
| Wagner Competition Intercooler | Intercooler | FL5 | Larger competition core | $890.00 |
| CSF All-Aluminum Radiator | Radiator | FL5 & DE5 | High-capacity, DE5-verified | $849.00 |
| Mishimoto Oil Cooler Kit | Oil cooler | FL5 | Thermostatic, lifetime warranty | $799.95 |
| Mishimoto Performance Radiator | Radiator | FL5 | Higher coolant volume, value pick | $749.95 |
Do You Need a Bigger Intercooler on the FL5 or Integra Type S?
You need a larger intercooler once you tune, because the factory unit heat-soaks and pulls timing under sustained boost. The COBB MT Intercooler Kit (around $1,225) is built to match COBB's FL5/DE5 Stage 1 and Stage 2 calibrations and fits both the Civic Type R and the Integra Type S. The Wagner Tuning Competition Intercooler (around $890) is the FL5-specific alternative with a large competition-grade core for track duty. Both drop intake air temperatures back toward ambient on repeat pulls so the ECU stops trimming power. If your car is still stock and street-driven, prioritize the oil cooler and radiator first; add the intercooler when you add the tune.
A thermostatic oil cooler kit is the highest-value reliability mod for a tracked K20C1.
A high-capacity aluminum radiator keeps FL5 coolant temps flat in Florida heat.
Installation Notes and Tampa Track-Day Advice
All of these parts are direct-fit for their listed applications and install with hand tools in a home garage, though the oil cooler kits require draining and refilling engine oil and bleeding the system. Budget two to four hours for a radiator swap and three to five for a full oil-cooler install with the air duct. At our Tampa, FL shop we always recommend a coolant burp on these cars — the FL5 cooling system can trap air — and a fresh, high-quality oil after any oil-cooler install. If you run summer track days in Florida heat, the oil cooler plus a high-capacity radiator is the combination that keeps a stock-power car reliable; add the intercooler the day you load a tune. Internal links: browse our full cooling collection for radiators, oil coolers, and intercoolers.
Frequently Asked Questions
Does the FL5 Civic Type R need an oil cooler?
Yes, the FL5 Civic Type R benefits from an oil cooler if you track it, because the factory car has no dedicated engine oil cooler and oil temperatures can climb past 260°F on repeat hot laps. A thermostatic kit like the HKS S-Type (around $1,790) or Mishimoto's kit (around $800) holds oil in range so the K20C1 makes consistent power. Street-only cars rarely need one.
Do FL5 cooling parts fit the Acura Integra Type S (DE5)?
Some do. The FL5 Civic Type R and DE5 Integra Type S share the K20C1 engine, and the CSF all-aluminum radiator and the COBB MT intercooler kit are explicitly listed to fit both. The HKS S-Type oil cooler, HKS air duct, and Mishimoto radiator and oil cooler are listed for the FL5 Civic Type R only, so Integra Type S owners should confirm fitment before ordering.
What is the first cooling mod I should buy for a Civic Type R?
Buy an oil cooler first if you track the car, a radiator first for street heat, and an intercooler first if you have a tune. Oil temperature is the K20C1's first track limiter, so a thermostatic oil cooler delivers the biggest reliability gain per dollar for most owners. If your car is tuned, the intercooler moves up the priority list because it protects power under sustained boost.
How much horsepower do FL5 cooling upgrades add?
Cooling upgrades do not add peak horsepower on their own; they protect the power the car already makes. On a hot day, a stock FL5 or Integra Type S loses output as oil and intake air temperatures rise and the ECU pulls timing. A bigger intercooler, radiator, and oil cooler keep temps down so the engine holds its 315–320 hp lap after lap instead of fading, and they let a tuned car realize its full gains.
Is the HKS or Mishimoto oil cooler better for the FL5?
The HKS S-Type is the more complete, track-focused kit and our top pick, while the Mishimoto kit is the value choice backed by a Lifetime Warranty. Both are thermostatic, so oil bypasses the cooler until it reaches roughly 180°F. Choose HKS for the most thorough setup (and pair it with the carbon air duct); choose Mishimoto to save roughly $1,000 while still solving oil temps.
Are aftermarket radiators worth it on a Civic Type R?
Yes, a high-capacity aluminum radiator is worth it if you see coolant temperatures creep on the street or track. The CSF (around $849, and DE5-verified) and Mishimoto (around $750, Lifetime Warranty) radiators add coolant volume and cooling surface over the factory unit, flattening temps in stop-and-go Florida heat and during back-to-back laps.
Keep Your K20C1 Cool, Lap After Lap
Shop oil coolers, radiators, and intercoolers for the FL5 Civic Type R and Integra Type S at NLP Performance.
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