Cycle-Rama 483 Cam Install & SP Concepts Big Bore Exhaust on a 2021 Harley-Davidson Street Glide

When it comes to unlocking real performance from a Milwaukee-Eight, cam selection matters. On this 2021 Harley-Davidson Street Glide, we installed the Cycle-Rama 483 camshaft and paired it with an SP Concepts Big Bore exhaust  featuring their Pro Flo headers creating a setup focused on horsepower, throttle response, and aggressive street performance without compromising ride ability.

This cam was picked for its early Horsepower delivery and the aggressive chop chop Harley riders are always chasing. The goal was usable power all the way through the RPM range, plus strong roll-on power. It's designed to bolt directly in Factory M8 107"/114" and 117".

Why the Cycle-Rama 483 Cam is a Great Match for the Street Glide

The Cycle-Rama 483 cam has earned its reputation for delivering excellent real-world performance on the Milwaukee-Eight platform. It is especially well-suited for heavier Touring models like the Street Glide that benefit from power delivery all the way through the rpm range. 

The 483 cam is known for:

• Strong low- and mid-RPM torque 

• Improved throttle response and acceleration

• Broad powerband that stays street-friendly

• Excellent compatibility with stock components

• Delivers that heavy CHOP CHOP CHOP sound

For riders who want their bike to pull harder without sacrificing smoothness or longevity, the CR483 is a proven choice.

Exhaust & Air Cleaner: Supporting the 483 Cam’s Powerband

A camshaft upgrade is only as good as the air intake and exhaust supporting it. The SP Concepts exhaust system was chosen to complement the Cycle-Rama 483 cam’s torque-focused powerband plus bonus points for the style on that new Black Onyx finish. It was also paired with the S&S Stealth Air Stinger Teardrop Air Cleaner. 

This exhaust setup:

• Reduces exhaust restriction

• Improves scavenging for better cylinder fill

• Enhances throttle response throughout the RPM range

• Delivers a deep, aggressive tone without excessive harshness

The sound matches the performance. Deep at idle, aggressive under throttle, and clean on deceleration.

The air cleaner:

• Offers more filter surface area

• Increased air flow can provide ~55% gain over a factory filter 

• Utilizes a washable element for longer use

• Looks damn good - we love the classic Teardrop style

How the Bike Feels After the Upgrade

Final Numbers: 120 HP / 131 TQ SAE

Final Numbers: 124 HP / 135 TQ STD

Above you'll see two Dyno Chart - SAE and STD. SAE corrected numbers account for temperature, humidity, and barometric pressure using a more conservative formula, which typically results in lower but more realistic horsepower and torque figures. STD corrected numbers use a less restrictive correction factor and usually show higher power numbers, which is why SAE is generally preferred for accurate comparisons, while STD is often used to display peak gains.

We did a quick walk around of the bike so you guys can hear it. Click the link to the Youtube Short to watch. 

Performance Upgrades Done the Right Way

At Get Lowered, we focus on performance upgrades that make a real difference for riders when they are out on the road. This Cycle-Rama 483 camshaft install paired with an SP Concepts exhaust is a perfect example of a well-matched setup done correctly.

No shortcuts. No unnecessary parts. Just proven components installed with precision to deliver real-world performance gains.

If you’re considering a cam upgrade for your Harley, and aren't quite sure where to start - give us a call, shoot us an email cs@getlowered.com or hit us up on Instagram. We'll help you get the right parts the first time.