
Yes, the 2001 Subaru RS 2.5 is naturally aspirated. The vehicle was powered by the EJ251, a 2.5-liter flat-four engine that was non-turbocharged and naturally aspirated. This set it apart from the turbocharged engines found in the higher-performance WRX and WRX STI models, positioning it as a powertrain focused on dependable and linear acceleration rather than peak boost pressure.


