I recently installed the ZARD Slip-Ons “4.5 Inches” Exhaust on my 2022 Harley-Davidson Street Glide ST—and wow, what a transformation.

Built With Italian Precision
Right out of the box, the craftsmanship was undeniable. Made in Italy from high-quality AISI 304 stainless steel, with anodized aluminum end caps, these slip-ons are as rugged as they are refined Despite their solid feel (racing version weighs 9.5 kg, while the homologated version is slightly heavier at 9.8 kg), the construction doesn’t look or feel heavy
Finish options like Black Chrome, Chrome, and Black Cerakote® give serious style cred—my pick was Black Chrome, and it instantly elevated the bike’s profile
Sound That Makes You Grin
At idle, the ZARD exhaust hums with a deep, almost brooding rumble that commands attention without shouting. Twist the throttle, and it crescendos into a rich, smooth growl—loud enough to announce your presence, but refined enough to ride all day without fatigue
Gain Without the Guesswork
Performance improvements are noticeable. The racing version boosted horsepower by +2.3 hp, while the homologated version offered +1.2 hp—both respectable gains that made acceleration crisper and throttle response more immediate
Installation Was a Breeze
I’m not a mechanic by trade, yet I had these slip-ons on and secured in under an hour. The bolt-on design fit like a dream, and there was no ECU tuning required Just torque them on and ride.

Ride Impressions: Beyond Expectations
On the open road, my Street Glide ST felt more alive. Mid-range throttle snaps with precision, and the increase in authority is palpable—especially when you lean into corners or merge onto the highway. Combine that with the head-turning sound, and every ride feels like a showcase.

After years of settling for standard pipes, I decided my 2023 Harley-Davidson Street Glide ST deserved more—the ZARD Slip-Ons “4.5 Inches” finally answered the call. From the box to the open road, this Italian upgrade transformed my ride.

Craftsmanship & Finish: The slip-ons feel beautifully substantial in my hands. Crafted from AISI 304 stainless steel and topped with CNC-machined anodized aluminum end caps, they exude quality and a custom edge. The finish is flawless—especially in the Black Chrome variant—adding a silhouette of sophistication that complements the bike’s design amazingly
Sound & Presence: At idle, the exhaust delivers a deep, authoritative rumble—just enough to attract attention without being abrasive. When I open the throttle, the sound blossoms into a smooth, muscular growl that turns every commute into a statement ride
Performance Boost: On the dyno, the racing version of this kit delivers a gain of +2.3 horsepower, while the homologated (street-legal) variant adds +1.2 hp. I opted for the racing version—it’s subtle but undeniably sharper throttle response and smoother acceleration
Installation: True to ZARD’s reputation, installation was a breeze. These slip-ons feature a bolt-on system that fit the Street Glide ST perfectly and required zero ECU tuning—just torque, bolt, and ride
Ride Impressions: Out on the highway, the difference is day and night. The bike feels more alive—throttle response is snappier, acceleration surges with confidence, and every pull reminds me of the power lying beneath that sleek fairing.

I recently treated my 2021 Harley-Davidson Street Glide ST to the ZARD Slip-Ons “4.5 Inches” exhaust, and let me tell you—it’s like giving the bike its own roar personality.

From the moment I unboxed them, the craftsmanship spoke volumes. The stainless steel finish is polished to perfection, and the weight feels substantial—nothing cheap here. Installation was a breeze: bolt-on design, no ECU tuning needed, and I had them on and ready to ride within under an hour
Once fired up, the bike growled with a deep, throaty note that felt like it stirred something in the engine. The idle has that commanding rumble that doesn’t scream but definitely announces your presence. Twist the throttle, and the sound crescendos into a rich, bold expanse that turns heads without testing anyone’s ear tolerance—just the right balance
Performance gains were noticeable immediately. The bike seems livelier, especially in mid-range throttle—cruising feels smooth, acceleration feels more immediate, almost like it’s unlocked another layer of responsiveness. It’s subtle but enough to remind you this is more than an aesthetic upgrade.

As for looks, I opted for the Black Chrome finish—sleek, modern, and it complements the Street Glide ST’s design beautifully
In short? If you want an upgrade that ticks all the boxes—sound, performance, fit, and style—ZARD’s 4.5-inch Slip-Ons deliver. My ride went from cool to commanding, and I'm loving every audible mile.