The Subaru WRX STI (facelift 2018), equipped with the 2.5-liter turbocharged Boxer engine producing 300 horsepower, represents a significant evolution of the iconic rally-bred sedan. Introduced as part of a mid-cycle refresh, this variant continued the STI’s legacy as a performance-focused all-wheel-drive vehicle, primarily targeted at enthusiasts seeking a highly capable and engaging driving experience. Production began in 2018 and continued with minor updates until the model was discontinued for the US market in 2021. It sits within the broader WRX/STI lineage, building upon the foundation of the WRX but offering substantial upgrades to the engine, drivetrain, suspension, and braking systems.
Technical Specifications
| Brand | Subaru |
| Model | WRX |
| Generation | WRX STI (facelift 2018) |
| Type (Engine) | 2.5 (300 Hp) AWD |
| Start of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 15.1-15.4 l/100 km (15.6 – 15.3 US mpg, 18.7 – 18.3 UK mpg, 6.6 – 6.5 km/l) |
| Fuel consumption (extra urban) | 8.4-8.7 l/100 km (28 – 27 US mpg, 33.6 – 32.5 UK mpg, 11.9 – 11.5 km/l) |
| Fuel consumption (combined) | 10.9-11.2 l/100 km (21.6 – 21 US mpg, 25.9 – 25.2 UK mpg, 9.2 – 8.9 km/l) |
| CO2 emissions | 252-259 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 255 km/h (158.45 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.1 kg/Hp, 196.5 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 266.5 Nm/tonne |
| Power | 300 Hp @ 6000 rpm |
| Torque | 407 Nm @ 4000 rpm (300.19 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EJ257 |
| Engine displacement | 2457 cm3 (149.94 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Boxer |
| Cylinder Bore | 99.5 mm (3.92 in.) |
| Piston Stroke | 79 mm (3.11 in.) |
| Compression ratio | 8.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.3 l (4.54 US qt | 3.78 UK qt) |
| Coolant | 7.7 l (8.14 US qt | 6.78 UK qt) |
| Kerb Weight | 1527-1566 kg (3366.46 – 3452.44 lbs.) |
| Max. weight | 2000 kg (4409.25 lbs.) |
| Max load | 434-473 kg (956.81 – 1042.79 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Max. roof load | 80 kg (176.37 lbs.) |
| Length | 4595 mm (180.91 in.) |
| Width | 1795 mm (70.67 in.) |
| Height | 1475 mm (58.07 in.) |
| Wheelbase | 2650 mm (104.33 in.) |
| Front track | 1530 mm (60.24 in.) |
| Rear (Back) track | 1540 mm (60.63 in.) |
| Ride height (ground clearance) | 135 mm (5.31 in.) |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent type McPherson |
| Rear suspension | Double wishbone |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 245/35 R19 |
| Wheel rims size | 8.5J x 19 ET 55 |
Powertrain & Engine Architecture
The heart of the 2018 STI facelift is the 2.5-liter EJ257 Boxer engine. This horizontally-opposed four-cylinder engine benefits from a closed-deck block design for increased strength, essential for handling the increased boost pressure from the IHI turbocharger. The engine utilizes multi-point fuel injection and a dual-active valve control system (AVCS) on both intake and exhaust camshafts, optimizing valve timing for improved performance and efficiency. The EJ257 produces 300 horsepower at 6,000 rpm and 290 lb-ft of torque at 4,000 rpm. The sole transmission option for the 2018 STI was a robust six-speed manual gearbox, renowned for its short throws and precise engagement. The symmetrical all-wheel-drive system, a Subaru hallmark, employs a driver-controlled center differential allowing for adjustments to front/rear torque bias.
Driving Characteristics
The 2018 STI delivers a raw and engaging driving experience. The 2.5-liter engine, while not as refined as some modern turbocharged units, provides a strong surge of power throughout the rev range. The six-speed manual transmission is a key component of the driving experience, offering precise control and a direct connection to the powertrain. The all-wheel-drive system provides exceptional grip, particularly in adverse conditions, allowing for confident cornering and acceleration. Compared to the standard WRX, the STI’s stiffer suspension and more aggressive tuning result in a firmer ride, prioritizing handling over comfort. The gear ratios are closely spaced, keeping the engine within its powerband during spirited driving. While the STI isn’t known for exceptional fuel economy, the performance trade-off is considered acceptable by enthusiasts.
Equipment & Trim Levels
The 2018 STI came relatively well-equipped, though options were available to further enhance the experience. Standard features included automatic climate control, a touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, keyless entry and ignition, and a suite of safety features including ABS, traction control, and stability control. Interior upholstery consisted of sport seats trimmed in a combination of cloth and leather. Optional extras included a premium audio system, Recaro sport seats, and a power moonroof. The STI trim level was positioned as the top-of-the-line WRX variant, offering a significant performance upgrade over the base WRX models.
Chassis & Braking
The STI’s chassis is significantly reinforced compared to the standard WRX, featuring additional bracing and thicker sheet metal. The suspension utilizes inverted MacPherson struts at the front and a double-wishbone setup at the rear, with stiffer springs and dampers. Braking duties are handled by Brembo ventilated discs at all four corners, providing excellent stopping power and fade resistance. The STI also features a quicker steering ratio than the WRX, further enhancing its responsiveness.
Market Reception & Comparison
The 2018 STI was generally well-received by automotive critics, praised for its performance, handling, and engaging driving experience. However, some criticisms were leveled at its relatively dated interior and fuel economy. Compared to the standard WRX, the STI offered a substantial performance upgrade, but at a higher price point. Against competitors like the Mitsubishi Lancer Evolution (discontinued in 2016) and the Volkswagen Golf R, the STI offered a unique blend of rally-bred performance and practicality. Reliability was generally good, though preventative maintenance, particularly regarding oil changes, was crucial for the longevity of the EJ257 engine.
Legacy
The Subaru WRX STI, particularly the 2018 facelift model, has cemented its place as a modern classic among performance car enthusiasts. The EJ257 engine, while known for its potential maintenance needs, remains a popular platform for modification and tuning. On the used car market, well-maintained STI models command a premium, reflecting their performance capabilities and enthusiast following. The discontinuation of the STI for the US market in 2021 has further increased its collectibility and desirability. The 2018 STI represents a high point in the STI lineage, offering a compelling combination of performance, handling, and all-weather capability.
