Built in-house in Darlaston, West Midlands
A Subaru engine build specified around the whole car
MB Developments builds Subaru Impreza engines in-house, from standard-specification rebuilds to bespoke high-performance and competition engines. The starting point is not a generic parts list: it is the vehicle, how it will be used, its supporting hardware and the power and response the owner wants.
Road · high power · competition
EJ20, EJ22, EJ25 and bespoke stroker combinations
Our experience covers EJ20, EJ22 and EJ25 engines along with 2.1 and 2.35 litre stroker combinations. Components are selected to suit the required specification rather than simply choosing the most expensive option.
We can develop the engine alongside the turbo system, fuelling, engine management, cooling and other supporting upgrades so the finished package is balanced and suitable for its intended use.
A clear, considered process
From first conversation to final development
- Enquiry and goalsWe establish the vehicle, present specification, intended use, priorities and realistic objectives.
- Inspection and diagnosisThe current condition and likely cause of any failure are considered before the new specification is agreed.
- Build specificationEngine, turbo, fuelling, ECU, cooling and supporting parts are planned as one compatible package.
- In-house assemblyThe engine is assembled at MB Developments using the agreed components and build approach.
- Installation and checksSupporting systems, fluids, sensors and initial operation are checked before meaningful load is applied.
- Running-in and tuning planWe explain the next steps for running-in, inspection and calibration appropriate to the build.
More than an assembled short block
Supporting systems that match the engine
Turbo and exhaust
Turbo sizing, boost response, exhaust flow and heat management planned around the target use.
Fuelling and cooling
Fuel delivery, injectors, oil control and cooling upgrades selected for the required duty.
ECU and electronics
Suitable factory ECU strategies or standalone management, sensors, looms and calibration.
Final specifications, component availability, lead times and any warranty terms are confirmed for each individual job before work begins.
Subaru engine builders in the West Midlands
Speak to the team before buying parts
MB Developments is in Darlaston, close to Walsall and Wolverhampton. If you are planning a Subaru engine rebuild or complete performance package, contact us with the model, existing specification, intended use and what you want the car to achieve.