Competition Clutch 1994-2005 Mazda Miata Stage 4 - 6 Pad Ceramic Clutch Kit
A turbocharged or supercharged 1.8 Miata will burn through a stock clutch, and even a good street upgrade can start to flare in third once boost comes on hard. The Competition Clutch 10045-1620 Stage 4 kit is built for that car: a 1994-2005 NA or NB Miata 1.8L making well past factory power, driven on track, at drag strips or in competition where holding torque matters more than a soft pedal.
Every 1.8 Miata clamps the disc between the flywheel and the pressure plate, and the hydraulic slave releases it through the fork and throwout bearing. How much torque the clutch can hold comes down to clamp load and the grip of the friction material. This Stage 4 kit changes the friction side completely: instead of a full-face organic disc, it uses a six-puck sprung hub disc with ceramic buttons, paired with a Competition Clutch performance pressure plate. Competition Clutch rates it at up to 250% more torque capacity than stock. A solid-hub version is sold separately under the -0620 suffix; this -1620 is the sprung version, which takes some of the shock out of engagement and is easier on the gearbox.
The trade-off is engagement. Ceramic pucks grab quickly with little slip window, so launches and parking-lot crawling take a deliberate foot. Owners who mainly commute should look at the Stage 2 kit 10045-2100 instead.
Load the car in fourth gear from about 2,500 rpm and go to full throttle or full boost. If rpm rises faster than speed, the clutch is slipping. Then check what is causing it. Oil on the disc from a rear main or input shaft seal leak will make any clutch slip, so look at the bellhousing drain area. A pedal that releases low or inconsistently is usually a hydraulic issue. Our slipping diagnosis guide covers telling real slip apart from other faults, and the flare vs slip guide explains what each one feels like from the seat.
Competition Clutch lists 10045-1620 for the 1994-2005 Mazda Miata NA/NB with the 1.8L engine. That covers the 1994-1997 NA 1.8 and the 1999-2005 NB. It does not fit the 1990-1993 1.6L cars or the 2006-up NC 2.0L. The 2004-2005 Mazdaspeed MX-5 also uses a 1.8, but confirm with us before ordering for one. If your car has a swapped engine or an aftermarket flywheel already, check the flywheel step and bolt pattern match a 1.8 setup. Not sure? Send your year and VIN and we will confirm. More options are in our rebuild kits and clutches category.
The maker's specification table lists the pressure plate, one 6-paddle ceramic disc, throwout bearing, pilot bushing and alignment tool. The flywheel is not included, even though some of the family marketing text mentions a flywheel where applicable. Plan on your own.
| Brand | Competition Clutch |
| Part number | 10045-1620 |
| Fits | Competition Clutch 1994-2005 Mazda Miata Stage 4 - 6 Pad Ceramic Clutch Kit |
| Vehicle fitment | Mazda Miata (1994-2005) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
It can be driven on the street, but the six-puck ceramic disc engages quickly with a narrow slip window, so stop-and-go traffic and hill starts take more effort. For a mostly stock or lightly modified daily driver, the Stage 2 full-face kit is the better match.
No. It is listed for the 1994-2005 Miata 1.8L only. The 1.6L cars use a smaller clutch and different flywheel. Send your year and VIN if you are not sure which engine you have.
No. The maker's specification table lists the pressure plate, disc, throwout bearing, pilot bushing and alignment tool, with flywheel included marked No. Use a resurfaced flywheel or a matching 1.8L lightweight steel flywheel.
Both are Stage 4 six-puck ceramic kits. The -1620 has a sprung hub disc, which takes some shock out of engagement. Competition Clutch notes that the -0620 versions use a solid hub disc instead.
Resurface or replace the flywheel, check the rear main seal and input shaft seal for leaks, and inspect the fork and pivot. If the clutch master and slave are original, replace them with a steel line so the hydraulics can handle the heavier clamp load.
Competition Clutch says to shift as often as possible during the first 500 miles so the disc material embeds into the flywheel and pressure plate faces. Avoid launches, long slips and track sessions until break-in is done.
