The WRX STI is the more hardcore sibling of the WRX. STI, those three magical letters mean this WRX has been turned up to eleven, it handles better, goes faster, and of course comes with a big rear wing. For the 2018 model year, Subaru gave the STI some upgrades which include a more aggressive face and better interior materials.
Powering the WRX STI is a turbocharged 2.5-liter flat-4 boxer engine which pumps out 296hp and 407Nm of torque, this is mated to a 6-speed manual transmission. As expected, this features the brand's Symmetrical AWD which can distribute torque to all 4 wheels.