124 To 128 Ci Highway Bully Package Gen 1 Or Gen 2 Full Build For 91 Octane Street Bikes

Meet the 124/128 Ci Highway Bully Package — Gen 1 or Gen 2 Full Build, a displacement-forward upgrade designed to transform a stock ride into a torque-rich street machine. Available in 124ci or 128ci, this turnkey package is engineered for real-world reliability and peak performance on 91 octane, delivering a confident, high-performance ride you can trust mile after mile.

Why this build stands out

• 128ci displacement with high-compression pistons creates a bold torque curve and strong mid-range pull, so you feel power where it matters most on the street.
• Gap Gang Performance Heads maximize airflow and breathing, unlocking more horsepower without sacrificing throttle response.
• S&S Top End Guardian Kit guards the valve train under hard use, helping you stay in the throttle longer without worry.
• Man O War crank paired with a Dark Horse sprocket delivers durable, smooth power delivery across rpm bands.
• S&S Cam Chest and Oil Pimp with Quickie Pushrods and billet tappet cuffs ensure a dependable lifter operating system and precise oiling for long-term reliability.
• S&S Oiler Jets provide precise fueling across the RPM range, supporting consistent performance as you rev higher.
• Fueling Short Travel Lifters promote fast, responsive valve actuation for a sharper throttle feel.
• Cam of our choosing to optimize torque delivery and throttle response for your setup.
• Optional professional install and dyno-tune to ensure peak performance and safe, reliable tuning.
• Complete, purpose-built solution focused on displacement, breathing, and engineered durability—standing apart from generic upgrades.

What you can expect

• Horsepower target: 150hp–160hp+ on 91 octane, with a strong, usable mid-range you can feel in everyday riding.
• Throttle feel: a responsive, intentional twist of the wrist thanks to optimized air intake and valve actuation.
• Reliability: robust components and protective measures designed to endure aggressive riding and sustained high RPM operation.
• Turnkey experience: a complete solution that’s ready to install and tune, with options to suit your preferences and schedule.

Ideal for riders seeking a bold, big-bore upgrade that remains street-friendly and easy to tune, the Highway Bully Package offers a real-world horsepower boost without compromising daily reliability. This Gen 1/Gen 2 full build is a thoughtful engineering convergence of displacement, breathing, and durability—delivering measurable gains you can feel on every ride.

Who this is for

Perfect for performance-minded riders who want serious torque and top-end punch, clear throttle response, and a reliable platform for street cruising, canyon carving, or spirited weekend rides. If you want a turnkey upgrade that delivers real horsepower, measured on the clock and on the street, this is the package to choose.

Tips to get the most out of your build

• Pair the build with a professional install and dyno-tune when you want to extract every watt of efficiency and ensure safe, peak performance.
• Run 91 octane reliably, and consider periodic dyno checks to maintain optimal fueling across seasons and elevation changes.
• Plan for supporting components (exhaust, intake, and fueling refinements) that complement the large displacement for best overall drivability.