K-Swap Cost Guide: Full 2026 Parts Breakdown
Posted by Matthew Marks on 3rd Mar 2025
How Much Does It Cost To K-Swap Your Car?
A realistic UK parts budget for a Honda K20 or K24 swap, using a Civic EK as the base example and showing where the money actually goes.
We have priced hundreds of K-swap packages since 2018, so this guide is built around the parts customers actually ask us for, not a fantasy, cheapest-possible parts list.
Shop K-Swap PartsA K-swap can look simple from the outside: buy a K20 engine, fit some mounts, wire it in and go. In reality, the cost comes from all the supporting parts around the engine, such as mounts, shifter parts, driveshafts, wiring, cooling, intake, exhaust and fuel system parts.
This refreshed guide uses a Honda Civic EK with an EG-style subframe as the base example because that is one of the most common K-swap conversations we have with customers. The same logic still helps if you are planning a Civic EG, Integra DC2, Honda Jazz, Honda Fit or another K-series project, but the exact mounts, shafts, wiring and fabrication costs will change.
If you already know you are doing the swap and want the fitting detail, use our K-swap installation guide alongside this cost guide.
The simple answer
For a realistic Civic EK K-swap parts budget, expect around £7,076.09 using popular new aftermarket parts and a used engine and gearbox package.
A cheaper DIY build can come in lower if you buy second-hand parts, make your own shafts and reuse more OEM parts. A high-spec build can easily pass £9,000 to £12,000+ once you add a new clutch, LSD gearbox work, ECU, mapping, labour, fabrication, brakes and suspension.
This is a parts guide, not a fixed quote. Engine prices, stock levels, used parts condition, and chassis choice can change the final number quickly.
- A realistic K-swap parts budget is £7,076.09 when using this used engine estimate and the verified 2026 product prices below.
- The engine is only part of the cost; mounts, shifter parts, wiring, fuel system and cooling parts add up fast.
- A K20 swap and a K24 swap often share many supporting parts, but K24 builds may need extra clearance, sump, mount or bonnet planning.
- Honda Jazz and Honda Fit K-swaps can cost more than an EK/EG/DC2 swap because kits and fabrication routes are usually less straightforward.
- Budget extra for labour, mapping, fluids, exhaust fabrication, MOT legality, brakes and problem solving.
Watch: In our K-swap cost video, we run through the parts and budget areas that catch people out when planning the swap.
K-Swap Cost Breakdown At A Glance
This is the saveable version of the guide. It shows the core parts we would budget for before optional upgrades, mapping and labour.
Engine, gearbox, loom, starter, alternator, sensors, charge harness, clutch/flywheel and EG-style subframe parts.
Mounts, shifter, cables, base plate, grommet, clutch line, throttle cable and DIY driveshaft budget.
K-swap exhaust manifold and cold air intake. Catback, catalyst and fabrication are not included here.
Conversion harness and immobiliser bypass for a stock ECU route.
Radiator, top hose, hose insert, fan and swivel thermostat housing.
Fuel rail, fuel pressure regulator and K-swap fuel line kit for converting to a returned fuel setup.
Estimated parts total: £7,076.09. Live Exoracing product prices were checked in May 2026. Used OEM parts remain estimates because condition, mileage and donor package contents vary.
Full 2026 running total
This is the detailed pricing table from the original guide, updated with live product prices checked in May 2026. The used engine, subframe and DIY driveshaft lines remain estimated lines because they depend on the parts you find.
What Parts Do You Need For A K-Swap?
The easiest way to plan the swap is to split it into systems. If you only price the engine, the budget will look far too low. From our experience, most unfinished K-swaps stall because the owner has not budgeted for the supporting parts around the engine.
OEM donor parts
Start with the engine and gearbox package. Ideally, you want the engine, gearbox, starter motor, alternator, sensors, engine loom, charge harness, clutch and flywheel. For a Civic EK using the common EG subframe route, you also need the subframe, steering rack and front control arms.
A used K20 or K24 package can vary massively depending on condition, mileage, gearbox type and what comes with it. For this guide, we are using a realistic middle figure of £2,000 for the engine and gearbox setup, plus £250 for subframe-related parts.
Mounts, shifter and drivetrain
The engine mounts are one of the first big aftermarket purchases. For an EK with an EG subframe, we normally see customers choosing a dedicated Hasport K-swap mount kit. For a road car, a softer bushing option, such as 62A or 70A, is usually more livable than a very stiff track-focused bushing.
You then need the shifter, shifter cables, base plate, firewall grommet, clutch line, throttle cable and driveshaft solution. Some owners build driveshafts using K-series shafts with B-series outer CV joints, while others buy a dedicated shaft kit. This is one area where a cheap choice can create a lot of wasted time if the lengths or joints are wrong.
Intake and exhaust
A K-series engine sits differently from the original D-series or B-series layout, so the standard intake and exhaust parts are not normally the answer. A dedicated K-swap intake gives better filter placement and makes the bay easier to package.
On the exhaust side, a K-swap manifold is needed to point the exhaust in the right direction and connect to the rest of the system. If the manifold removes the catalytic converter, you need to plan the exhaust properly for UK road legality and MOT requirements.
Electronics and ECU route
The stock ECU route is common because it keeps the first build cost under control. To make that work, you normally need a chassis-specific conversion harness and an immobiliser bypass. This lets the K-series engine work with the original chassis wiring and clocks, where the conversion harness supports it.
An aftermarket ECU, such as a Haltech setup, costs more, but it gives more control for boosted, high-compression, race or future-proofed builds. If your plan includes turbocharging later, it is worth pricing the ECU and mapping route from the start rather than buying twice.
Cooling system
The cooling layout changes because the engine and hose positions change. A K-swap radiator moves the top port to a more suitable position, while the correct hoses, hose insert, fan and thermostat housing help you finish the system cleanly.
This is not the area to ignore. A swapped car that runs hot, traps air or uses a weak old hose can undo a lot of expensive work quickly.
Fuel system
Many K-swap routes need the fuel system to be converted to a return setup. That usually means a fuel rail, fuel pressure regulator and fuel lines. If you are building a higher power car, also check the pump, injector and line sizing with your mapper before buying parts twice.
Watch: In our K-swap essentials video, we cover the main supporting parts that sit around the engine package.
Essential K-Swap Parts To Price First
These are high-impact parts to price early because they decide whether the swap physically fits, shifts properly and can be finished without constant rework.
Hasport Engine Mount Kit K-Swap For Honda Civic EK
Dedicated EK K-swap mounting solution when using the common EG subframe route.
From £736.97
Hybrid Racing Shifter Cables For Honda Integra DC5
Matched shifter cables for completing the DC5 shifter setup on common K-swap layouts.
From £442.00
Hybrid Racing K-Swap Cold Air Intake System
A cleaner intake route for EK, EG and DC2 K-swap engine bay layouts.
From £232.00
Hybrid Racing K-Swap Fuel Lines
Helps complete the returned fuel system on EG, EK and DC2 K-swap builds.
From £179.00
K20 Swap Cost vs K24 Swap Cost
A K20 swap and a K24 swap can share a lot of the same supporting parts, but the engine choice changes the budget and fitment planning.
Good availability, strong aftermarket support and lots of known EK, EG and DC2 combinations.
Budget for extra clearance checks, sump and mount compatibility, bonnet clearance, intake manifold choice and ECU/mapping decisions.
If you are asking how much a K24 swap costs, do not just compare engine prices. Compare the full finished package, because a cheaper engine can become more expensive once you solve fitment and setup details.
What About A Honda Jazz Or Honda Fit K-Swap?
A lot of people search for Honda Jazz K20 swap kits, Honda Fit K-swap costs and Jazz K24 swap ideas. The short version is that the same cost logic applies, but you should expect less bolt-on simplicity than a Civic EK, EG or Integra DC2.
The engine, gearbox, ECU, fuel, cooling and exhaust still need pricing, but the mounting, driveshaft, shifter, clearance and fabrication side can be more specialised. If you are building a Jazz or Fit, treat this £7,076.09 Civic-style estimate as a starting point, not a final figure.
Costs People Forget To Budget For
The parts list above gets the main swap components covered, but it does not cover every job that makes the car finished, legal and enjoyable to use.
Budget for fitting, exhaust work, wiring checks, problem-solving and setup time.
A poor ECU route or unfinished map can make an expensive swap unreliable.
Check clearance around wiring, fuel lines, clutch lines, coolant hoses and intake parts before the first long drive. Our heat management parts can help where protection is needed.
Do not spend the whole budget on power and leave old brakes, worn bushes or weak tyres untouched.
Common K-Swap Budget Mistakes
Buying the engine before pricing the supporting parts
A cheap engine is not a cheap swap if the missing parts cost more than expected. Price the whole system first, then decide whether the donor engine is actually a good value.
Ignoring the gearbox
Gearbox choice affects ratios, LSD options, driveshaft compatibility and how the car feels. A tired gearbox can turn into another expensive job after the swap is already fitted.
Leaving exhaust legality until the end
A manifold that physically fits is not the whole exhaust system. If the car is road used, plan the catalyst, noise level, clearance and MOT requirements early.
Fitting heat protection as a shortcut for poor routing
Heat sleeve, reflective tape and shielding are useful when parts must live near heat, but they are not a replacement for safe routing. Fix leaks, damaged wiring and bad clearance first, then add protection where the layout still needs it.
Optional Parts Worth Considering
Once the core swap is planned, optional upgrades can improve shift feel, reliability, engine bay room or tuning control. They are not all mandatory, but they are worth pricing before the car is apart.
- Silicone coolant hoses: sensible if the old hoses are unknown, brittle or perished.
- Detent and gear selector springs: a small upgrade that can noticeably improve shift feel.
- Alternator relocation: useful when larger intake manifolds need more space.
- Electric water pump kit: more specialised, usually for serious track, drag or ECU-controlled setups.
- Air conditioning or power steering retention: important if the car still needs road comfort.
- Aftermarket ECU: worth budgeting for if the build will move beyond a basic naturally aspirated setup.
Is A K-Swap Worth The Cost?
A K-swap is worth it if you want a strong Honda engine platform, good aftermarket support and a car you are happy to build properly. It is usually not worth it if the car needs to be a cheap, quick fix or if the budget only covers the engine.
The best way to decide is to price the full parts list, then add a realistic buffer for labour, fluids, fabrication, mapping and problem solving. If that number still makes sense, the swap is much less likely to turn into a half-finished project.
K-Swap Cost FAQs
How much does a K-swap cost in the UK?
A realistic parts budget is £7,076.09 for this Civic EK-style K-swap example using a used engine package estimate and verified 2026 aftermarket supporting part prices. Labour, mapping, fabrication, fluids, brakes and optional upgrades can push the finished cost much higher.
How much does it cost to K-swap a Civic?
For this Civic EK example, the parts cost comes to £7,076.09 before labour and optional upgrades. The exact total for an EK, EG or similar Honda chassis depends on the engine package, mount route, wiring route, gearbox and how much fabrication is needed.
Is a K20 swap cheaper than a K24 swap?
Usually, a K20 swap is the simpler route because there are more known combinations for common Honda chassis. A K24 can be good value, but you need to budget for clearance, sump, mount, intake and ECU decisions rather than judging the cost only by the engine price.
How much does a Honda Jazz or Honda Fit K-swap cost?
Use the Civic-style £7,076.09 estimate as a starting point, then add chassis-specific research. Jazz and Fit swaps may need more specialist mounts, shafts, clearance work, wiring choices and fabrication, so the finished cost can be higher than a common Civic swap.
Can I K-swap a car cheaply?
You can reduce the cost by buying used parts, making some parts yourself and doing your own labour, but the swap still needs the correct mounts, wiring, fuel system, cooling system, intake, exhaust and drivetrain solution. Cutting the wrong corner often costs more later.
Do I need a full K-swap kit?
A full kit can save time if it matches your exact chassis and engine route. If you are building the parts list yourself, make sure the mounts, shifter, shafts, wiring, cooling and fuel system are compatible with each other rather than buying parts one at a time without a plan.
What is the most expensive part of a K-swap?
The engine and gearbox package is usually the biggest single purchase, but the supporting parts can cost more overall. Mounts, shifter parts, wiring, exhaust, cooling, fuel system, ECU and mapping all need to be included in the real budget.
Does the £7,076.09 estimate include labour?
No. The estimate is for the main parts list only. Labour, mapping, fluids, welding, exhaust fabrication, MOT work, delivery, broken bolts, worn donor parts and optional upgrades should all be budgeted separately.
Final Decision
A realistic K-swap is not just the price of a K20 or K24 engine. For this Civic EK-style build, plan around £7,076.09 for the main parts list, then add your labour, mapping, fabrication and optional upgrades.
If you want the next step, build your parts list system by system: donor package, mounts, shifter, shafts, wiring, intake, exhaust, cooling, fuel and ECU. Then compare that finished number against the car you actually want at the end.
You can browse our K-swap parts range, use the K-swap installation guide for fitting details, or use discount code BLOG5 at checkout, where eligible.
Shop K-Swap PartsAbout The Author
This guide was written by Matt from Exoracing.
We are a UK-based performance parts and heat management specialist, helping enthusiasts and workshops choose practical parts for modified cars since 2018. Our advice comes from product knowledge, customer builds, support questions and the parts we supply every day.