BridgeSource Auto is actively engaging specialist suppliers across the K-swap product categories listed below. Product availability, compatibility, pricing and lead time must be confirmed for each individual build before an order is accepted.
This guide is not an installation manual. Every conversion is application-specific. Professional installation or inspection by a suitably experienced automotive professional is recommended.
Engine and Gearbox Selection
The K-Series engine family includes variants suited to different power and budget targets. Common choices for EG applications include the K20A, K20A2, K20Z3 and K24 with compatible K-Series gearbox selected according to the intended use, ratios and final drive. Gearbox selection affects axle compatibility, shift cable routing and ECU requirements.
- K-Series engine (code and specification to be confirmed)
- K-Series gearbox (ratio set and final drive to be confirmed)
- Engine and gearbox mating hardware
Chassis-Specific Engine Mounts
EG Civic engine mounts are chassis-specific and must be selected for your exact subframe configuration. Incorrect mounts will affect driveshaft alignment, exhaust routing and shift cable geometry.
- Front engine mount and bracket
- Rear engine mount and bracket
- Transmission mount and bracket
- Mounting solution selected for the existing subframe or planned subframe conversion
Shifter Box, Mounting Hardware and Cables
The K-Series uses a cable-operated shifter. EG applications require a shifter box relocation, chassis bracket and correctly routed cables matched to the gearbox and interior position.
- Shifter box (K-Series compatible)
- Shifter mounting bracket and hardware
- Shift cables (length and routing specific to EG chassis)
- Shift cable end fittings and adjusters
Intermediate Shaft and Axle Solution
The K-Series gearbox requires a gearbox-compatible intermediate shaft. Axle shafts must be matched to the gearbox output flanges and front hub specifications.
- Intermediate shaft (gearbox and chassis specific)
- Driver-side axle shaft
- Passenger-side axle shaft
- Axle retention hardware and circlips
Wiring Harness, ECU and Immobiliser Integration
A full engine wiring harness conversion is required. ECU selection determines immobiliser strategy, VTEC control, launch control and tuning options. OEM and aftermarket options each carry different integration requirements.
- K-Series engine wiring harness
- ECU (OEM or aftermarket — to be confirmed for intended use)
- Chassis harness adapter or conversion
- Immobiliser, key transponder and ECU integration
- Sensor adapters (where required by chassis or ECU)
Fuel System
The K-Series fuel demand must be matched by the fuel pump, lines and regulator. EG fuel systems may require upgrading depending on power target.
- Fuel pump (flow rate matched to build target)
- Fuel pressure regulator
- Fuel lines and fittings
- Fuel filter (where applicable)
Intake and Throttle System
Intake manifold and throttle body selection affects power delivery, idle quality and ECU compatibility. Drive-by-wire throttle bodies require ECU support.
- Intake manifold (OEM or aftermarket)
- Throttle body and gaskets
- Intake pipe and air filter
- Cold-air or short-ram intake system
Cooling System
Cooling capacity and hose routing must be selected for the engine, power target, intended use and available chassis space.
- Radiator (sized for K-Series output and EG bay)
- Upper and lower coolant hoses
- Thermostat housing adapter (if required)
- Coolant expansion tank and cap
Exhaust Conversion
A K-Series exhaust manifold or header must be used with a custom or application-specific downpipe and exhaust system matched to the EG chassis.
- Exhaust manifold or header (K-Series)
- Downpipe (EG chassis specific)
- Catalytic converter and compliant exhaust components for the vehicle’s intended road or competition use
- Exhaust system or link pipe
Suspension, Brakes and Chassis Preparation
Increased power output requires consideration of suspension geometry, brake performance and chassis condition. This section covers supporting components recommended for a complete, safe build.
- Coilover or spring and damper set (application-specific)
- Front and rear sway bars (if upgrading)
- Brake upgrade components (discs, pads, lines — as required)
- Chassis inspection and repair items
Service Items and Completion Hardware
Fresh service items and completion hardware ensure the build starts correctly and is not compromised by worn consumables.
- Engine oil and filter
- Coolant
- Spark plugs (K-Series specification)
- Timing-chain, tensioner and related service components, where required
- Engine bay fasteners and hardware kit
- Breather and catch-can system
Optional: Power Steering
Power steering options depend on the engine accessories, mount arrangement, rack type and intended use. The following configurations must be assessed for compatibility with your specific build:
- Hydraulic power steering conversion components
- Electric power steering (EPS) conversion
- Manual steering configuration
- Associated brackets, hoses and hardware
Optional: Air Conditioning
Retention or deletion of air conditioning requires planning. Compressor relocation or deletion affects belt routing and engine bay layout.
- A/C compressor relocation bracket (retention), or
- A/C delete pulley and belt (deletion)
- Associated hoses and fittings (if retaining)
Request Your K-Swap Sourcing Plan
BridgeSource Auto verifies compatibility, availability, pricing and lead time before accepting an order. Submitting a request does not create a purchase obligation.
To help us prepare your sourcing plan, please provide:
- Chassis code
- Model year
- Current engine
- Intended K-Series engine and code
- Gearbox code
- ECU choice (OEM or aftermarket preference)
- Intended use (street, track, daily, competition)
- Existing modifications
- Parts you already own
Submit a Request a Part enquiry →
Every K-swap conversion is application-specific. This guide is not an exhaustive installation or safety manual. Parts must be confirmed against your donor chassis, engine code, gearbox, ECU, intended use and existing modifications. Installation should be completed or inspected by a suitably experienced automotive professional.
BridgeSource Auto is an independent aftermarket parts business. Honda and associated model names are trademarks of their respective owner. BridgeSource Auto is not affiliated with, authorised by or endorsed by Honda Motor Co., Ltd.