Unlocking Power: A Rider’s Guide to Milwaukee-Eight® Stage Kits

Every Harley-Davidson rider eventually asks the same question:
“How do I get more out of my motor?”

If you’re riding a Milwaukee-Eight® engine—whether it’s a 107, 114, 117, or 121—you’ve got a serious foundation to build on. And Harley’s official Stage Kits give you the factory-engineered path to unleash next-level performance.

At Caliente Harley-Davidson, we install more of these kits than you’d think. Here's everything you need to know before upgrading your ride.

🔧 Stage I: Better Sound, Better Breathing

What it does:
Stage I improves your engine’s efficiency with a high-flow air cleaner and performance exhaust, along with the required tuning to match.

Why riders love it:

• Deeper, throatier exhaust note

• More responsive throttle

• Factory-backed performance without going deep into the motor

Best for: Riders who want a little more punch and presence without cracking the engine open.

🔥 Stage II: Torque or Power—Your Choice

What it does:
Stage II introduces a performance camshaft, tuned for either low-end torque or high-end horsepower, depending on how you ride.

Why riders love it:

• Torque cam = arm-stretching acceleration off the line

• Power cam = stronger pull at highway speeds and top end

• Big difference in how your bike feels—without major teardown

Best for: Riders who want to feel real performance gains every time they twist the throttle.

🏁 Stage III: Big Displacement, Big Gains

What it does:
Stage III takes your M8 engine up in cubic inches—upgrading pistons, cylinders, and cam to deliver significant horsepower and torque gains across the board.

Why riders love it:

• More cubes = more power, plain and simple

• Ideal for baggers or riders looking to pass with ease even two-up

• All done with Harley factory components

Best for: Serious performance riders or anyone hauling gear, passengers, or pulling long distances.

💀 Stage IV: The Full Send

What it does:
This is the top-tier performance kit from Harley-Davidson. New heads, cam, throttle body, injectors, pistons, and more. It’s a full system built to dominate—while keeping factory reliability and warranty coverage (when installed by a dealership).

Why riders love it:

• Maximum horsepower

• Total engine transformation

• Factory fit, tested durability

Best for: Riders who want it all. No compromises.

⚙️ What to Know Before You Upgrade

• All kits require proper tuning, and we use Harley’s Screamin’ Eagle® Pro Street Tuner to keep things within factory specs.

• Each step builds on the one before—you can’t skip ahead to Stage III or IV without doing I and II first.

• Installed by our certified techs, upgrades may maintain your factory warranty.

🔧 Ready to Feel the Difference?

There’s no substitute for real power—and no better way to unlock it than with a Screamin’ Eagle® Stage Kit. Whether you’re looking to wake up your daily cruiser or transform your bagger into a highway monster, Caliente Harley-Davidson is your go-to performance shop.