This Stage 3 Performance 116 ci Big Bore Kit transforms a Thunderstroke® 111 into a high-performance 116-ci power plant delivering 20% more horsepower and 15% more torque. Experience quicker acceleration and increased torque – without sacrificing reliability. This kit contains everything needed for the engine, including: new cylinders, big bore pistons, larger throttle body, and more. Dealer installation required. Also requires Stage 1 Exhaust, Exhaust Tips, and Stage 1 Performance Air Cleaner or Thunderstroke® High Flow Air Cleaner (each sold separately).Important Regulatory InformationThis item is only available for purchase and installation at your dealer. To find your dealer, click here. 20% more horsepower15% more torqueKit includes everything needed for engineDealer installation requiredRequires Stage 1 Exhaust, Exhaust Tips, and Stage 1 Performance Air Cleaner or Thunderstroke ® High Flow Air Cleaner IND 2019 Springfield Dark Horse 2019 Springfield 2019 Roadmaster 2019 Chieftain Limited 2019 Chieftain Dark Horse 2019 Chieftain Classic 2019 Chieftain 2019 Chief Vintage 2019 Chief Dark Horse