Subaru of America's in house performance division, STP (which stands for Subaru Performance Tuning), will reveal a custom-built Impreza WRX STI at the Las Vegas SEMA Show next week. The WRX STI gets all sorts of goodies from the SPT catalog such as a sportier exhaust system that boosts the 2.5-liter turbocharged boxer engine's output from 305 HP to 315 HP at 6,000 rpm with peak torque remaining stock at 290 lb.-ft. at 4,000 rpm and a turbo heat shield.
