I just installed the ZARD Slip-Ons "4.5 Inches" Exhaust on my 2024 Harley-Davidson Street Glide ST, and wow—what a transformation! First off, the fitment was flawless. These slip-ons slide right into place thanks to the bolt-on design—no ECU tuning, no drama. It took me under an hour to go from stock mufflers to a completely revitalized roar.
The craftsmanship is nothing short of art. Handmade in Italy from high-grade AISI 304 stainless steel, the build feels rock-solid. The aluminum end caps are anodized to perfection, and I went with the Black Chrome finish—it’s sophisticated, bold, and gives the rear end of my ST a sleek modern edge.
Sound? Absolutely commanding. At idle, the bike growls with a smooth, throaty rumble that turns heads at every corner. Hit the throttle, and it pulses into a soulful, assertive roar—loud enough to announce your presence, yet refined enough to avoid being overbearing.
Performance gains are legit. I rode with the Racing version, and I could seriously feel the extra +2.3 HP pushing me forward—quicker throttle response, livelier acceleration, more controlled power delivery.
If you’re looking at the homologated variant, expect a still-noteworthy boost of +1.2 HP, with a slightly heavier weight at 9.8 kg versus the 9.5 kg of the racing option.
In summary, the ZARD 4.5″ Slip-Ons are a masterpiece of form and function: outstanding quality, effortless fitment, an epic sound, and real performance gains. If you're riding a Street Glide ST from 2017 to 2024 and want to elevate both the look and feel of your bike, these are absolutely worth the upgrade.

I recently fitted the ZARD Slip-Ons “4.5 Inches” Exhaust onto my 2020 Harley-Davidson Street Glide ST, and the transformation has been nothing short of exhilarating.

From the moment I removed the old mufflers, the precision of the fit was evident—the bolt-on design worked like a charm and lining everything up felt seamless. There was absolutely no need for ECU tuning or complex adjustments, so within an hour I was road-ready—just as the product promises
Aesthetically, these slip-ons strike a perfect balance. I chose the Black Chrome finish, and it’s both striking and refined—adding attitude without overpowering the bike’s classic lines. The craftsmanship on these is undeniably premium, with stainless steel and anodized aluminum end caps that look as durable as they feel
But of course, the real magic is in the rumble. At idle, the bike comes to life with a rich, deep growl that commands attention. When I open the throttle, it turns into something majestic—a throaty roar that sounds aggressive yet not overbearing. It’s exactly the kind of auditory presence an ST deserves on the open road.

On the performance front, I noticed a measurable bump in horsepower—the homologated version is rated at +1.2 HP, while the racing version offers a stronger +2.3 HP My bike feels more responsive, especially during acceleration out of corners and at highway speeds. I can feel the engine breathing more freely, and that translates to a ride that’s smoother, snappier, and oh so satisfying.

In summary, the ZARD Slip-Ons are a class act. They deliver on style, sound, and performance—without the headache of complex installation or tuning. If you're riding a Street Glide ST (2017–2024) and want to inject some Italian flair and grit into your ride, this is the upgrade to make.

I recently installed the ZARD Slip-Ons “4.5 Inches” Exhaust on my 2023 Street Glide ST, and it’s honestly one of the best upgrades I’ve made. From the fit and finish to the sound and performance—you can feel the quality infused in every aspect.

Build & Appearance:
First off, the craftsmanship is phenomenal. These slip-ons boast AISI 304 stainless steel construction with anodized aluminum end caps, delivering a solid feel without unnecessary bulk
The finish I opted for—Black Chrome—offers a sleek yet bold look that elevates the bike’s aesthetic in both daylight and dusk
Sound & Vibe:
Start the engine and you’re greeted with a deep, throaty rumble that’s commanding—but not overwhelming. When you crack the throttle, it blossoms into a refined growl that gets the head nods rolling ﹣ power-packed but smooth. ZARD nailed the balance between presence and sophistication here
Performance Feel:
The racing version claims a horsepower bump of +2.3 HP, while the homologated version gives +1.2 HP And you can absolutely feel it. Throttle response is sharper, acceleration feels more fluid, and the ride feels more alive in every gear. It’s subtle yet noticeable—exactly what you hope for from a high-end slip-on.

Installation:
No fuss at all. The bolt-on design is straightforward, and everything locks into place just as it should, no ECU tuning neededI had it on in under an hour and was back on the road before I knew it.

Summary:
If you’re after an exhaust that melds artisan craftsmanship with strong performance and refined sound, the ZARD Slip-Ons “4.5 Inches” are a stellar choice. They look great, ride great, and deepen the Street Glide ST experience in a way that feels genuinely premium.

Review:

From the moment I unpacked the ZARD Slip-Ons, I knew I was in for something special. The packaging alone hinted at true craftsmanship. Once mounted on my 2021 Street Glide ST, the transformation was immediate—both in style and substance.

Look & Feel:
The stainless steel finish (I opted for the black chrome) is absolutely flawless. Even under morning sun, those pipes glint with just the right smoky sheen—elevating the bike’s silhouette without shouting it. The weight feels robust, yet you can tell it’s precision-engineered and solid to the touch.
Sound & Presence:
At idle, the bike settles into a deep, authoritative rumble that drops you into Harley territory. Crack open the throttle, and the exhaust blooms into a bold, smooth roar—not ear-splitting, but commanding and deeply satisfying. It’s the kind of growl that makes you grin every time you twist the throttle.
Performance Perks:
This isn’t just about attitude—the upgrade delivers tangible gains. I experienced noticeably crisper throttle response and a livelier punch through the low to mid-range. While I didn't dyno test, ZARD reports gains of about +2.3 HP for the racing version (and +1.2 HP for homologated), and I could feel every bit of that on my rides.
Installation:
True to their claim, this was a bolt-on beauty. Everything matched up seamlessly and took less than an hour. There was no need for ECU remapping—just install, tighten, and go.
Conclusion:
If you ride a Street Glide (especially ST) from 2017 to 2024 and want to upgrade your exhaust with something that blends Italian artisan style, effortless installation, a potent sound, and real-world performance, these ZARD Slip-Ons are it. They’ve given my rig a premium boost that I feel every time I ride—and hear—that unforgettable rumble.