I recently upgraded my 2010 Harley‑Davidson Road King Special with the ZARD 4.33‑inch slash‑cut slip‑ons, and the difference is striking. Instantly, the bike sounds deeper and more aggressive—yet it’s artful, not overwhelming.

I opted for the racing version in matte black Cerakote, and it’s a showstopper. Crafted in Italy from AISI 304 stainless steel and topped with billet aluminum end caps and a laser‑etched ZARD logo, the exhaust adds real character and a refined sporty touch
Installation was refreshingly easy—just slip‑ons, align, and ride; no ECU tuning required. I also appreciate the tangible performance edge—ZARD claims a 2.2‑hp gain on the racing version and a modest weight reduction of 0.3 kg versus OEM, which I can feel in throttle response
If I had one wish, it’d be for just a touch more volume—future iterations might benefit from an optional baffle system for adjustable growl. Still, visually and audibly, this upgrade elevates the whole package.

In short, the ZARD 4.33-inch slash-cut slip-ons are a beautiful, performance-oriented upgrade. If you want your Road King Special to look sharper and ride with more authority, this is a stunning choice.

I recently fitted the ZARD 4.33‑inch slash‑cut slip‑ons to my 2012 Harley‑Davidson Road King Special, and I'm genuinely impressed. From the second I fired up the engine, the transformation was unmistakable. The exhaust now emits a deep, rumbling growl that’s powerful yet refined — exactly the kind of commanding tone that enhances the bike’s presence without being obnoxious.

The build quality speaks volumes. These slip‑ons are handcrafted in Italy from premium AISI 304 stainless steel, featuring meticulous TIG welding, matte black Cerakote finish, and billet aluminum end caps. Every detail feels robust and high-end — a perfect match for the Road King’s iconic styling.
Performance-wise, I noticed a tangible difference. The racing version supposedly adds about 2.2 hp while shaving off approximately 0.3 kg compared to the OEM system — and it really shows in throttle response and mid-range power delivery.
Installation was a breeze. It slipped on cleanly, lined up perfectly, and required no ECU remapping. The whole process took less than an hour, which was a huge bonus.
In sum, the ZARD 4.33-inch slash-cut slip-ons are a stellar upgrade: they sound commanding, look exceptional, perform noticeably better, and are easy to install. If you're eager to give your Road King Special more character — both visually and audibly — these are a no-brainer.