According to a VIN decoder document sent to the National Highway Traffic Safety Administration the 2019 Subaru WRX STI’s turbocharged 2,5-litre flat-four engine may be gaining a bump in power.

Sourced by The Truth About Cars (TTAC), the document suggests the WRX may gain an extra 4 kW, pushing the overall power output to 231 kW (while the SA-spec model still makes 221 kW, the US version moved up to 227 kW in January 2017). The 2,0-litre WRX remains unchanged at 197 kW.

This is the same increase in power that the limited edition STI Tyre Ra was given.

This nominal power increase has been achieved via a new high-flow exhaust system, larger intakes and a retuned ECU. Despite these revisions  torque figure remained the same.

TTAC contacted Subaru of America regarding this uncovered document. “Too early for us to comment”, was the official reply.