Name: KPower K24Z3 Ultimate Swap Package for 1990-2005 Mazda Miata (NA NB)
Brand: KPower Industries
SKU: KM-K24Z3-ULTIMATE-5SP-R-C
Price: 4395.0 USD
Availability: InStock

KPower K24Z3 Ultimate Swap Package for 1990-2005 Mazda Miata (NA NB)

Select hydraulic release bearing configuration:

Miata 5-speed

Miata 6-speed

Select engine mount material:

Rubber (street)

Polyurethane (race)

Select throttle body type:

Cable

Drive-By-Wire

Price

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Lead times for shipment vary. Please reference our Current Lead Times page for the most up-to-date fulfillment estimates.

The K24Z3 swap is a strong choice for NA and NB Miatas that must retain the OEM subframe for class-legal racing. While the K24A2 remains our most popular and versatile platform, the K24Z3 fills an important niche. Want a deeper dive into the differences? Check out our K24A2 vs. K24Z3 blog post.

Version 3 of our Ultimate K24Z3 Swap Package builds on everything we’ve learned from years of testing in our own Z3-powered development cars. This latest iteration improves compatibility, simplifies wiring options, and adds greater flexibility for throttle body configurations.

New for 2025: This package includes our redesigned hydraulic release bearing, which offers improved durability and longer service life, while allowing use of the factory 5/8" clutch master cylinder.

Pair this kit with one of our Electronics Packages to power your swap with a Haltech Elite 1500, Link G4X, or Hondata KPro.

Package Includes:

K series to Miata transmission adapter plate
Lightweight K series to Miata flywheel
Machined engine mounts with improved rubber or poly mount pads
Baffled aluminum oil pan with custom pickup
Machined K20 oil pump adapter housing
Hydraulic clutch release bearing (5-speed or 6-speed) with braided lines
KPower RWD intake manifold with gasket and hardware
K24Z3 upper coolant neck
Slim flywheel dust cover
Serpentine belt
3” stainless downpipe with flex section

Throttle Body Options (choose one):

Drive-by-wire throttle body adapter with Bosch 74mm throttle body
OR
74mm cable throttle body with billet cable wheel, Acuity TPS, and adapter

Notes:

K20 Oil Pump Required: This package requires a K20 Type S oil pump. We recommend our K20 Oil Pump Package for best results.
Clutch Compatibility: For reliable operation of the hydraulic bearing, we strongly recommend the Exedy Stage 1 clutch, which maintains tight pressure plate tolerances.
K24Z7 Compatibility: The K24Z7 is mechanically identical to the K24Z3 and is fully compatible with this swap package.
Hondata KPro Users: KPro setups require our cast timing cover, along with the K24A-style crank sensor, trigger wheel, and exhaust cam trigger wheel. Please refer to the installation guide for details.

Download installation instructions here

KPower Recommended Supporting Parts:

KPower Haltech Elite 1500 Electronics package (Drive By Wire)
Link G4X ECU with KPower RWD Engine Harness and Miata Conversion harness (Drive By Cable)
K24Z3 OEM Parts Package
- Includes the required K20 Oil Pump Conversion
K24Z3 Engine Sensor Package
USDM Water Pump Housing
Fluidampr Harmonic Balancer crankshaft pulley
KPower Modified Baffle Plate Valve Cover
- NA version
- NB version
KPower NA/NB Catch Can Kit
Haltech CAN Gauge or iC-7 display
NA/NB Electric Power Steering System
NA/NB Air Conditioning system with wiring harness
KPower DBW Pedal mount
KPower Flex Fuel Kit
Winning Formula DBW Throttle Body adapter (substitution for KPower adapter)