The 2007 Subaru Impreza represents a significant moment in the model's evolution, offering a blend of capability and efficiency that defined a generation of compact sedans and hatchbacks. Under the hood, buyers found a refined and responsive powertrain that balanced daily drivability with the brand's signature all-wheel-drive traction. Understanding the specifics of this model year's engine options helps clarify its performance character and long-term ownership considerations.
Engine Specifications and Performance
The primary powertrain for the 2007 Impreza was the EJ254, a 2.5-liter horizontally-opposed (boxer) four-cylinder engine. This configuration is central to Subaru's design philosophy, lowering the center of gravity and providing a smooth, balanced feel. For the standard naturally aspirated model, the EJ254 produced 173 horsepower and 174 lb-ft of torque, mated to a five-speed manual transmission or an optional four-speed automatic. This combination delivered a spirited yet practical driving experience, with the manual offering engaging control and the automatic providing smooth convenience.
Turbocharged Option: The WRX and WRX STI
For drivers seeking more power, the 2007 model year featured the turbocharged variants, the WRX and the high-performance WRX STI. These models utilized the turbocharged version of the EJ25, generating 300 horsepower in the STI and 227 horsepower in the standard WRX. This surge in output transformed the Impreza into a genuine performance hatchback, with the STI's available six-speed manual transmission allowing enthusiasts to fully harness the engine's potential. The turbochargers provided a noticeable boost in mid-range acceleration, making highway merging and overtaking particularly effective.
Fuel Economy and Efficiency
Fuel efficiency remains a key factor for many buyers, and the 2007 Impreza delivered respectable numbers across its range. The base model with the manual transmission achieved an EPA-estimated 23 city / 31 highway mpg, making it an economical choice for daily commutes and longer trips. The automatic transmission variant saw a slight decrease to 22 city / 30 highway mpg. Drivers of the turbocharged WRX models experienced lower but still competitive figures, with the manual returning 21 city / 28 highway mpg, demonstrating that performance did not come with an exorbitant fuel penalty.
Reliability and Long-Term Ownership
The Subaru boxer engine has a long-standing reputation for durability, and the 2007 models are generally considered solid examples of this engineering. With proper maintenance, which includes regular oil changes and attention to the cooling system, these engines can easily surpass 200,000 miles. While specific components like the timing belt (or chain on later models) and turbocharger wastegate on the WRU models require vigilance, the fundamental design is robust. Sourcing parts is generally straightforward due to the model's popularity and Subaru's extensive dealer network.
Driving Dynamics and Integration
The true value of the 2007 Impreza's engine is realized through its integration with the standard symmetrical all-wheel-drive system. Power is distributed to all four wheels, providing exceptional grip in various weather conditions, from rainy city streets to light winter snow. This setup transforms the car's handling, making it feel planted and stable through corners. The engine's responsive nature, particularly in the WRX, pairs perfectly with this chassis, creating a cohesive and engaging driving experience that feels both planted and agile.
