Mishimoto 2017+ Honda Civic Type-R Thermostat (MMTS-CTR-17)
Mishimoto 2017+ Honda Civic Type-R Thermostat (MMTS-CTR-17)
Mishimoto
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PRODUCT DETAILS
The Mishimoto Racing Thermostat (part MMTS-CTR-17) is a lower-temperature thermostat for the 2017+ Honda Civic Type R, including the FL5 (2023+) and FK8 (2017-2021), K20C1 engine. It starts opening 10°C earlier than the factory thermostat, so coolant flows into the radiator and starts shedding heat sooner.
Fitment
- Honda Civic Type R FL5, 2023 and newer
- Honda Civic Type R FK8, 2017-2021
- Engine: K20C1
Specifications
- Manufacturer part number: MMTS-CTR-17
- Begins opening: 68°C / 154.4°F (stock: 172.4°F), 10°C earlier
- Fully open: 83°C / 181.4°F, 7°C earlier than stock
- Warranty: Mishimoto lifetime warranty
What's in the box
- 1 Mishimoto racing thermostat
Good to know
A thermostat will not fix a clogged, damaged, leaking or undersized cooling system. Mishimoto recommends keeping up with scheduled cooling maintenance and pairing it with a radiator suited to your use.
FAQ
Does it fit the FL5?
Yes. Mishimoto lists both the FK8 and FL5 chassis.
What temperature does it open at?
It begins opening at 68°C (154.4°F) and is fully open at 83°C (181.4°F).
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
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WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
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Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
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Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
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If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
The Mishimoto Racing Thermostat (part MMTS-CTR-17) is a lower-temperature thermostat for the 2017+ Honda Civic Type R, including the FL5 (2023+) and FK8 (2017-2021), K20C1 engine. It starts opening 10°C earlier than the factory thermostat, so coolant flows into the radiator and starts shedding heat sooner.
Fitment
- Honda Civic Type R FL5, 2023 and newer
- Honda Civic Type R FK8, 2017-2021
- Engine: K20C1
Specifications
- Manufacturer part number: MMTS-CTR-17
- Begins opening: 68°C / 154.4°F (stock: 172.4°F), 10°C earlier
- Fully open: 83°C / 181.4°F, 7°C earlier than stock
- Warranty: Mishimoto lifetime warranty
What's in the box
- 1 Mishimoto racing thermostat
Good to know
A thermostat will not fix a clogged, damaged, leaking or undersized cooling system. Mishimoto recommends keeping up with scheduled cooling maintenance and pairing it with a radiator suited to your use.
FAQ
Does it fit the FL5?
Yes. Mishimoto lists both the FK8 and FL5 chassis.
What temperature does it open at?
It begins opening at 68°C (154.4°F) and is fully open at 83°C (181.4°F).
How long does shipping take?
Delivery times vary by part because many items ship directly from the manufacturer or distributor. Message us before ordering and we'll confirm current lead time.
Can I return it?
Yes. Returns are accepted within 30 days of delivery. The customer pays return shipping, and a restocking fee of up to 20% may apply.
