Record-Breaking Year for Haltech Horsepower Heroes The Haltech Horsepower Heroes series delivered another seismic moment as Darren Portelli’s wild twin-turbo HQ Holden surged to victory in the finals, clocking an astounding 3,697 horsepower. The dramatic performance capped a record-breaking year, building on Portelli’s earlier 3,407hp run from Thursday and signaling a new era for Australian…