I recently bolted the ZARD Slip-Ons “4.5 Inches” Exhaust onto my 2021 Harley-Davidson Road King Special, and let me tell you—it completely transforms the ride.

First off, the quality is next level. These slip-ons are handcrafted in Italy using AISI 304 stainless steel, which gives them a rugged yet polished feel and ensures they’re built to last. The different finish options—including sleek Black Chrome, classic Chrome, and stealthy Black Cerakote®—are topped off with a billet anodized aluminum endcap and that unmistakable Zard nameplate. Talk about stylish upgrades that turn heads on every ride!
Sound-wise, these goodies hit the sweet spot. At idle, there’s a deep, commanding rumble that demands attention—but it never crosses into obnoxious territory. Open the throttle, though, and the growl crescendos into an aggressive yet refined roar that feels like pure adrenaline. It’s the perfect balance of presence and refinement.
Performance gains are the real surprise. I opted for the racing (non-homologated) version, and the difference is noticeable. Not only is the system lighter than stock, but it also delivers a solid boost in power and torque—Zard advertises an approximate +2.2 hp gain and +6.9 Nm of torque—and in real-world riding, I absolutely felt that surge in responsiveness across the throttle band.
Installation? A breeze. The fitment was spot-on—everything aligned perfectly, and the exhaust dropped right in without drama. I had it on in under an hour, with zero modifications needed.
Final Thoughts: If you're after a premium exhaust that blends Italian craftsmanship, striking design, rich audio signature, and measurable performance gains, the ZARD “4.5 Inches” Slip-Ons are worth every cent. Your Road King Special will not only look and sound legendary—it’ll ride like a whole new beast.

I recently upgraded my 2022 Harley-Davidson Road King Special with the ZARD Slip-Ons “4.5 Inches” Exhaust, and I’m genuinely impressed. The moment I fired up the bike, the deep, resonant growl turned heads—not too boomy, just the right amount of rumble to announce my arrival.

Installation was smoother than expected; the stainless steel build felt solid and the craftsmanship really speaks volumes—no rattles, just that satisfying weld quality I wasn’t sure I’d get. The anodized aluminum endcaps add a subtle premium touch that matches the rest of the bike’s aesthetic beautifully. Black Chrome suits my dark color scheme perfectly
Performance-wise, the racing version delivered a notable bump. I felt about +2.3 hp more grunt when I pinned the throttle—sure, it’s not a massive jump, but the added responsiveness makes a world of difference when merging or cruising For those in Euro 5-regulated areas, the homologated version still offers a respectable +1.2 hp if you prefer keeping your bike street-legal
The only reason I’m holding back a full five stars is cost: at over US $1,500, it's a premium investment. But if you're after Italian-crafted quality with solid build, sound, and a modest performance boost—and you're willing to pay for it—it’s hard to beat
Bottom line: This isn’t just an exhaust—it's an upgrade that elevates the Road King Special experience. Worth every penny for anyone serious about style and substance.

I recently installed the ZARD Slip-Ons "4.5 Inches" Exhaust on my 2023 Harley Davidson Road King Special, and the results have been outstanding. The improvement in both sound and performance is incredible, and I’m more than impressed with this upgrade.

First, the quality of the ZARD slip-ons is remarkable. The chrome finish is flawless, and the pipes feel incredibly durable. The 4.5-inch diameter adds just the right amount of presence, providing a bold, aggressive look without being over the top. The craftsmanship is second to none, and these slip-ons have elevated the bike's aesthetic to a whole new level.

Sound-wise, the ZARD exhaust is a game-changer. At idle, the bike now has a rich, deep rumble that immediately grabs attention. When I twist the throttle, the exhaust roars to life with a smooth, powerful growl that’s music to my ears. It’s loud enough to make an impact but not so loud that it becomes overwhelming—it’s the perfect balance of power and refinement.

Performance-wise, I can feel the difference immediately. The throttle response is much sharper, and the bike feels more responsive across the entire rev range. It feels like the bike is breathing easier, and that has translated to smoother acceleration and more power throughout the ride. Whether I’m cruising down the highway or taking on twisty backroads, the ZARD slip-ons have made the ride feel even more enjoyable and exciting.

Installation was a breeze. The fitment was perfect, and I had the exhaust installed in just under an hour. The instructions were clear, and everything lined up seamlessly. ZARD made the process easy and hassle-free.

If you’re looking to upgrade the sound and performance of your Harley Davidson Road King Special, the ZARD Slip-Ons "4.5 Inches" Exhaust is a must-have. It’s a high-quality, well-designed product that enhances the riding experience in every way. I couldn’t be happier with this purchase!

I recently installed the ZARD Slip-Ons "4.5 Inches" Exhaust on my 2022 Harley Davidson Road King Special, and I have to say, the transformation is unbelievable. This exhaust has taken my bike to a whole new level of performance and sound.

The quality of the ZARD slip-ons is top-notch. The chrome finish is flawless, and the construction feels incredibly solid. They’ve given my Road King Special a custom look that really stands out. The 4.5-inch pipes are the perfect size—large enough to make a statement, but not so big that they overwhelm the bike's design. They complement the Road King’s classic aesthetic while adding a modern, aggressive flair.

Sound-wise, these slip-ons are a game changer. The stock exhaust was fine, but it didn’t do justice to the bike's potential. The ZARD slip-ons deliver a deep, throaty rumble that truly reflects the power of the Road King Special. At idle, it has a rich, commanding presence, and when you open the throttle, it roars to life with a smooth, aggressive growl. It’s loud enough to turn heads without being obnoxious, which is exactly what I was hoping for.

As for performance, I’ve noticed a definite improvement in throttle response and overall smoothness. The bike feels more responsive, especially at lower speeds and during acceleration. The exhaust allows the engine to breathe more freely, which has improved power delivery and made the ride feel smoother and more enjoyable. It feels like the engine is running more efficiently, and I’m definitely getting better power on demand.

Installation was a breeze. The fitment was perfect, and I had them installed in about an hour. The instructions were clear and easy to follow, and everything fit just as it should. ZARD made the installation process straightforward, even for someone who doesn’t have a ton of mechanical experience.

If you own a Harley Davidson Road King Special and want to enhance both the sound and performance of your bike, I highly recommend the ZARD Slip-Ons "4.5 Inches" Exhaust. It’s a high-quality, premium upgrade that has made my bike more powerful, more enjoyable to ride, and just plain more fun. I couldn’t be happier with the purchase.

I just installed the ZARD Slip-Ons “4.5 Inches” Exhaust on my 2020 Harley-Davidson Road King Special, and I’m truly impressed. Right off the bat, the build quality stands out—these slip-ons are handcrafted in Italy using AISI 304 stainless steel, giving them a robust, high-end feel and excellent resistance to the elements
I went with the Black Chrome finish, and the sleek, polished look with billet anodized aluminum end caps and the signature Zard nameplate absolutely transforms the bike’s appearance—elevating it from stock to showpiece
Sound-wise, these things deliver a deep, aggressive rumble that's attention-grabbing without becoming unbearable. It strikes a perfect balance—rumble at idle, then a throaty roar when you open it up. It feels refined, not obnoxious.

Performance has noticeably improved. I opted for the racing version, and even though a 2.3 hp gain might not sound massive, it’s palpable—especially in throttle response and acceleration The bike just feels more alive, easier to maneuver into corners, and stronger when accelerating through traffic.

Installation was smooth—fitment was spot-on, and nothing needed adjusting. Took less than an hour to swap them in.

So why not a full five stars? First, the price—these are premium parts, and at over US $1,500 (or around €1,100 in Europe), it’s an investment And while the sound is rich, if you’re after ear-shattering volume, these are subtle in comparison to full systems.

Bottom line: ZARD delivers a stunning union of Italian craftsmanship and American muscle. These slip-ons look incredible, sound powerful yet polished, and give a noticeable performance bump. If you're serious about upgrading your Road King Special with top-tier style and substance, they're worth every cent.