Engine Performance Kits

117 products

Our selection of Engine Performance Kits for Harley-Davidson brings together the upgrade packages riders turn to when they want more power, cleaner throttle response and a bike that feels truly alive. Iron Stable is run by Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, so every kit listed here is chosen with real-world Big Twin, Sportster and Touring applications in mind. You will find stage upgrade kits, cam and intake bundles and supporting hardware from leading performance names including S&S Cycle and Trask Performance, covering classic Evolution engines through to modern Milwaukee-Eight machines. Whether you are chasing extra midrange for your Softail, fine-tuning a Dyna build or opening up a Road Glide for long UK touring, our Harley-Davidson engine performance kits are picked to match the way these bikes are actually ridden. Browse the full range below.