Screamin’ Eagle Stage 4 Upgrade | Big Bore & High-Flow Heads

If you want the ultimate factory performance upgrade for your Harley-Davidson, the Screamin’ Eagle Stage 4 kit is where things get serious. 🔥 Stage 4 builds on the big bore setup from Stage 3 but takes performance even further by adding high-flow cylinder heads, performance camshaft, larger throttle body, and upgraded intake components. The result is massive horsepower and torque gains, transforming your Harley into a true high-performance machine. In this video, we break down what the Stage 4 upgrade includes and why it delivers the strongest acceleration and highest power output available from Screamin’ Eagle performance kits. Installed by the certified technicians at Durham Harley-Davidson, these genuine Screamin’ Eagle components are engineered specifically for Harley-Davidson engines—giving you race-inspired performance while maintaining reliability. Benefits of a Screamin’ Eagle Stage 4 Upgrade: 🏍️ Big bore engine upgrade for increased displacement 🔥 High-flow cylinder heads for maximum airflow ⚡ Massive horsepower and torque gains 💨 Stronger acceleration and high RPM performance 🛠️ Professionally installed by Harley-Davidson certified technicians If you're ready to turn your Harley into a true high-performance bagger, the Screamin’ Eagle Stage 4 kit delivers incredible power and a completely different riding experience. Stop by Durham Harley-Davidson and talk with our team about the ultimate performance upgrade for your bike. 📍 Visit Durham Harley-Davidson at 880 Champlain Avenue Oshawa 📞 Call to book your performance install 905-434-6550 🔧 Ask about Screamin’ Eagle Stage upgrades Don’t forget to like, comment, and subscribe for more Harley-Davidson performance upgrades, bike builds, and behind-the-scenes content from Durham Harley-Davidson. #HarleyDavidson #ScreaminEagle #Stage4Upgrade #HarleyPerformance #BigBore #DurhamHarleyDavidson #MilwaukeeEight #HarleyMods