⟲ 360° — drag meThe facts.
| Brand | Akrapovic |
|---|---|
| Part number | S-H3SO12-HBFGSS |
| Fitment | Honda CB350RS and GB350S (2025–2026) |
| Line | Slip-On Line (Stainless Steel) |
| Materials | High-grade stainless steel, sandblasted finish |
| Weight | 2.3 kg (stock 3.1 kg, saving 0.8 kg / 25.8 %) |
| Power | 19.5 PS (stock 19.1 PS, gain 0.7 PS at 5,600 rpm) |
| Torque | 29.3 Nm (stock 28.9 Nm, gain 1.0 Nm at 3,000 rpm) |
| Noise insert | Removable insert included |
| Road approval | EC and ECE type approval, plus EPA |
DescriptionThe whole story▼
Nineteen horsepower. This is the smallest engine in the Akrapovic road catalogue, and the exhaust built for it is not a performance part in any meaningful sense — it is a piece of design for a motorcycle that is itself a piece of design.
Key Features
- Conical muffler in high-grade stainless steel with a sandblasted finish
- End cap with imprints, finished with a monochrome sticker
- 2.3 kg against the standard 3.1 kg: 0.8 kg and 25.8 per cent less
- 1.0 Nm more at 3,000 rpm and 0.7 PS at 5,600 rpm
- Removable noise insert included
- EC and ECE type approved, plus EPA
Built to Match the Bike
Akrapovic states the exhaust was designed to accompany the neo-retro design of the motorcycle. The conical shape, the sandblasted surface rather than a polish, the imprinted end cap and the monochrome sticker are all choices that would look wrong on a sportsbike and look right here.
Stainless steel rather than titanium is part of that. A blued titanium can on a machine styled after a 1970s single would be an obvious mismatch, and it would also cost considerably more.
A Newton Metre at Three Thousand Revs
On a 348 cc single making 19 PS, the useful measure is not peak power but what happens where the engine spends its life. Akrapovic records 1.0 Nm more at 3,000 rpm — a small number on a small engine, but proportionally the same order of gain as a litre bike sees.
Approved, and With an Insert
Both EC and ECE approval are in place, and the exhaust ships with a removable noise insert. The insert belongs in place for road use; taking it out changes the exhaust from the condition in which it was approved.
One Motorcycle, Two Names
Honda sells this machine as the GB350S in Japan and as the CB350RS in India, where it is built. Both names appear on Akrapovic's fitment list because both are the same motorcycle, and European owners will have arrived at one through import or through Honda's limited continental availability.
If your registration document says something else again — Honda has used a third name in some markets — send us the frame number and we will confirm the fit before you order.
Thirty Minutes
A single-cylinder with one exhaust port and a silencer held by a clamp and two springs is about as simple as this work gets. Thirty minutes covers it, and nothing about the job requires a lift.
Fitment and Compatibility
S-H3SO12-HBFGSS covers the Honda CB350RS and the GB350S for model years 2025 and 2026. The two names are the same motorcycle in different markets. Installation is quoted at 30 minutes.
Specifications
- Part number: S-H3SO12-HBFGSS
- EAN: 3831126450618
- Fitment: Honda CB350RS, GB350S (2025–2026)
- Line: Slip-On Line (Stainless Steel)
- Material: high-grade stainless steel, sandblasted
- Weight: 2.3 kg (stock 3.1 kg, saving 0.8 kg / 25.8 %)
- Power: 19.5 PS (stock 19.1 PS, gain 0.7 PS at 5,600 rpm)
- Torque: 29.3 Nm (stock 28.9 Nm, gain 1.0 Nm at 3,000 rpm)
- Noise insert: removable, included
- Installation time: approx. 30 minutes
- Road approval: EC and ECE type approval, EPA
- Country of manufacture: Slovenia
DownloadsInstructions▼
FitmentWhich bikes this fits▼
- Honda CB350RS (2025–2026)
- Honda GB350S (2025–2026)
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.