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Screamin' Eagle® Performance

Screamin' Eagle® Performance Stage Kits take performance to the next level with increased acceleration and improved passing power when compared to stock bikes.  No longer will you have to experience all the trial and error that comes with your bike engine modifications. 


By separating the process into stages, you have the choice to see how each upgrade affects your bike and your ride.  Screamin’ Eagle stage kits are offered in a variety of options designated as Stage I, II, III and IV.  The higher number kits provide the greatest increase in performance. 


Stage I is the starting point with the option to upgrade to a higher numbered stage kit in the future.


Intake + Exhaust + Tuning = Foundation for Future Upgrades

“I want a simple, bolt-on performance upgrade that enhances the performance, look, and sound of my motorcycle.”


Choose your Intake

More airflow equals more power.  Select between Air Cleaners that allow you to maintain the stock Air Cleaner Cover or upgrade to Air Cleaners featuring stylized covers and/or stylized cover inserts.


Choose your exhaust

Exhaust is dialed in to enhance the performance and sound of your engine when paired with a free-flowing air cleaner and proper tuning.


Tune It Like A Pro

When upgrading your intake and exhaust, you must recalibrate your Engine Control Module (ECM), also known as tuning.  Start with the Screamin’ Eagle Pro Street Tuner.

See our Web-based training guide.


Take it to the next level

Add the Smart Tune Pro - Build off of the Pro Street Tuner and its base calibrations as a starting point.

Maximum Performance + Optimal Efficiency + Automatic Adjustment in all riding conditions and combinations of performance upgrades. 


Stage I + Cam Upgrade

Torque: “I want instant passing power at cruising and highway speeds.”

Power: “I want to feel the power build and then pull all the way to the redline.”


Take your engine’s power to the next level

Cam choices allow you to tailor the engine’s performance to your specific needs.  A torque cam offers on-demand throttle response from low to mid RPM at cruising speed.  A power cam targets high RPM, wide-open throttle response that keeps pulling right up to the redline. 


Stage I + Cam, Big Bore Cylinders & Pistons

“I want instant power that lasts throughout the entire RPM range.  Bigger is better.” 


Add big bore cylinders & pistons

Here is where you start to build a bigger engine.  Stage III produces instant passing power without downshifting and delivers excellent stoplight to freeway and on-ramp acceleration.


Stage I + Cam, Big Bore Cylinders, Pistons, Cylinder Heads & Throttle Body

“I ride hard and want the absolute best performance upgrade available.  Try to keep up…I dare you!” 


The final touch – CNC Ported Heads & Throttle Body

To maximize the impact of the increased displacement gained with Stage III updates, the addition of free-flowing CNC ported cylinder heads and a big bore throttle body top off the performance build.

Builder Components

Builder Components

Our high-end components give you everything you need to build your own custom racing machine. Labor and complexity can vary due to custom fitting of components or detailed clearance measurements, so be sure to check with the customization experts at your local Harley-Davidson® dealer. 

Crate Engines

Crate Engines

Built from the bottom up in Milwaukee, our street-tuned Screamin’ Eagle Crate Engines are designed to run with a wide open throttle at high engine speeds and provide instant passing power from cruising speeds. The 135-cubic-inch Engines are available for select ’21-later Touring models and 131-cubic-inch Crate Engines are available for Softail models.


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