Can you turbocharge an Impreza?
Yes, it’s technically possible to add turbocharged power to an Impreza, but it isn’t a simple bolt-on job on a non-turbo model. For most owners, the practical path is to start with a factory turbo model (the WRX/WRX STI) or plan a substantial engine swap and supporting upgrades. This article explains your options, what to expect, and the risks involved.
Understanding the options
There are two broad routes to turbocharged performance on an Impreza: using a factory turbo model or attempting an aftermarket turbo setup on a non-turbo car. Each path has its own requirements, costs, and trade-offs.
Factory turbo versions (WRX/WRX STI)
Subaru sold turbocharged versions of the Impreza under the WRX and WRX STI badges. These models come with a turbocharged engine, all-wheel drive, and performance-focused components that are engineered to work together. Features and output varied by model year and market, but the WRX line is designed from the ground up for turbocharged performance, with sturdier transmissions, upgraded intercoolers, and tuned engine management. If you’re chasing turbocharged thrills with relative reliability and a built-to-performance baseline, a factory WRX (or STI where available) is the straightforward option.
- Impreza WRX: A turbocharged variant offering significantly more power and sportier handling than the base Impreza, with AWD as a core characteristic.
- Impreza WRX STI: A higher-performance sibling with a stronger engine, upgraded drivetrain components, and enhanced cooling; available in various generations with substantial power gains.
- Market and year variations: Engine sizes, turbo configurations, and output changed over time and across regions, so specifics depend on the exact model year and country.
These factory models provide a turnkey turbo experience with calibrated fueling, cooling, and warranty considerations (where applicable). They are the least risky way to enjoy turbocharged performance from an Impreza without extensive customization.
Aftermarket turbocharging a non-turbo Impreza
People sometimes consider adding a turbo to a non-turbo Impreza, but this is a major engineering project. It typically involves not only installing a turbo kit but also reworking the engine internals, fueling, engine management, exhaust, cooling, and often the suspension and transmission to handle the extra power. In many cases, this path ends up being more complex and costly than simply starting with a factory turbo model or swapping in a compatible turbo-powered engine.
- Engine swap routes: Replacing the stock engine with a factory turbo engine from a WRX/STI or another compatible turbocharged Subaru can yield a reliable turbo setup, but it requires mounting, wiring, ECU integration, and drivetrain compatibility work.
- Aftermarket turbo kits: Some vendors offer turbo kits for NA Subarus, but compatibility depends on the model year and engine code. Custom fabrication, fuel-system upgrades, and ECU tuning are typically required. Reliability hinges on proper installation and iteration.
- Fuel, control, and cooling upgrades: You’ll likely need higher-capacity fuel injectors, a stronger fuel pump, an upgraded intercooler, oil cooler, and a capable engine-management solution to avoid detonation and overheating.
Bottom line: an aftermarket turbo on a non-turbo Impreza is a high-commitment project that should be entered with a clear plan, skilled technicians, and realistic budget expectations.
Practical considerations
Beyond power, a turbo project touches many aspects of the car’s lifecycle. Here are key points to weigh before proceeding.
- Reliability and durability: Turbos generate additional heat and stress; if the engine internals, cooling, and lubrication aren’t upgraded appropriately, the risk of issues rises.
- Warranty and legality: Turbo projects often void remaining warranties and may affect emissions compliance and local inspections. Check your region’s rules and insurance requirements.
- Cost and value: A proper turbo build on a base Impreza can become expensive, sometimes exceeding the value of the car or approaching the cost of a used WRX. Factor parts, labor, and tuning into your budget.
- Compatibility and future maintenance: Not all Impreza generations share compatible parts with turbo variants; future maintenance may require sourcing specialized components and expert service.
Careful planning, budgeting, and professional guidance are essential if you decide to pursue a non-turbo-to-turbo upgrade.
Cost and feasibility
Costs vary widely based on the chosen route, vehicle generation, and the level of turbo performance you want. General ranges to consider:
- Factory WRX/WRX STI purchase: Higher initial cost but a complete, calibrated turbo setup with established reliability and parts availability.
- Engine swap to a turbocharged Subie engine: Parts, labor, wiring, and tuning can run into the mid to high five figures, depending on the donor engine and required modifications.
- Aftermarket turbo kit on a NA Impreza: Parts plus installation and tuning can range from several thousand to well over ten thousand dollars, depending on complexity and whether custom fabrication is needed.
Before committing, get quotes from reputable shops, verify compatibility with your exact model year, and consider the long-term costs of maintenance, fuel, and potential warranty gaps.
Summary
Turboncharging an Impreza is possible, but not as a simple add-on for a stock base model. The most practical routes are to buy a factory turbo Impreza (WRX/WRX STI) or to pursue a careful, well-planned engine swap or aftermarket build with expert support. Expect substantial costs, and weigh reliability, legality, and insurance implications. For most enthusiasts seeking turbocharged Subaru performance, starting with a WRX or similar turbocharged platform remains the easiest and most reliable path.
