is continuing to stretch the performance limits of its STI sub-brand and this time with the fifth iteration of its "s" series. Those are tuned-up cars of already tuned-up variants of the Subaru WRX
Impreza STI. The 2.0-liter four-cylinder turbocharged engine has been enhanced through a weight balance between piston, connecting rod and optimized crankshaft, ECU and improved turbocharger. It now has an output of 315hp and 318 lb-ft.