"Available exclusively as a Crystal Grey Metallic manual sedan, the WRP10 includes an STI engine performance upgrade kit increasing peak power from standard WRX's not-insignificant 168kW @ 6000rpm to 175kW @ 6000rpm (or about 238 horsepower).
The STI upgrade kit includes a replacement Electronic Control Unit to change fuel injection mapping and other aspects, plus upgraded exhaust components and a unique large single tip muffler."
7kw over a stock WRX is 2/10 of fug all and perhaps just the rear muffler makes that, if it's a better design than the wrx milo tin.
verso wrp10 v wrx would be same/same....
**I do see a note that says the WRP10
ecu cannot be flashed as is is electronically locked by STI....probably encrypted.**