⟲ 360° — drag meThe facts.
| Brand | Akrapovic |
|---|---|
| Part number | S-B16SO5-HZAAT |
| Fitment | BMW K 1600 GT (2025–2026) |
| System type | Slip-on silencer pair |
| Materials | Titanium with carbon fibre outlet caps |
| Weight | 8.4 kg (stock 11.7 kg, saving 3.3 kg / 28.2 %) |
| Power | 144.0 PS (stock 142.4 PS, gain 2.3 PS at 5,870 rpm) |
| Torque | 161.4 Nm (stock 159.9 Nm, gain 2.7 Nm at 5,600 rpm) |
| Road approval | EC type approval and ECE type approval |
DescriptionThe whole story▼
Three point three kilograms off the back of a six-cylinder tourer. BMW revised the K 1600 for 2025 with a new engine meeting Euro 5+, and this is the Akrapovic system built for that generation — 8.4 kg against a standard assembly of 11.7.
Key Features
- 8.4 kg against the standard 11.7 kg: 3.3 kg and 28.2 per cent less
- 2.3 PS more at 5,870 rpm and 2.7 Nm more at 5,600 rpm — the touring band
- Peak output 144.0 PS, peak torque 161.4 Nm
- Titanium construction with carbon fibre outlet caps
- Sound tuned specifically for the six-cylinder engine over long distances
- Removable noise insert supplied
- EC and ECE type approved
The 2025 Generation Takes a Different Part
BMW rebuilt the K 1600 for 2025: a revised 1,649 cc six meeting Euro 5+, new electronics and a changed exhaust route. The system that fits the 2011 to 2024 machines does not carry over.
If your K 1600 is older, the part you want is S-B16SO4-HZAAT for the GT and GTL, or S-B16SO3-HRAATBL for the B Bagger. The three are not interchangeable, and a K 1600 does not announce its generation from ten paces — check the first registration date before ordering.
Six Cylinders, and What an Exhaust Can Do With Them
BMW's transverse six is the smoothest engine on any production motorcycle and the standard exhaust is built to keep it that way: two large, heavily damped silencers that give away nothing. Opening that up is the reason most owners fit an Akrapovic here, and the company tunes the sound for long distances rather than for a short burst — a tourer that becomes tiring after two hours is a worse motorcycle.
The 2.3 PS and 2.7 Nm arrive around 5,700 rpm, which on a machine geared this long is motorway cruising with luggage and a passenger.
Weight on a 340 Kilogram Motorcycle
A K 1600 GT weighs about 340 kg ready to ride. 3.3 kg is one per cent, and on paper that sounds like nothing. It comes off the rearmost, widest point of the machine, which is the mass that has to be lifted every time the bike leaves upright and the mass that resists a change of direction most.
What Stays Standard
This is a slip-on pair, so the headers, the catalytic converter and the engine management are untouched. No remapping is required and the original silencers refit if the motorcycle has to go back to factory condition — which on a machine at this price point is worth knowing before a trade-in.
Fitment and Compatibility
S-B16SO5-HZAAT covers the BMW K 1600 GT for model years 2025 and 2026 and is supplied as a pair.
Road Approval
EC type approval and ECE type approval, with the certificates supplied and downloadable here. The silencers are legal replacement parts for road use in the European Union.
Specifications
- Part number: S-B16SO5-HZAAT
- EAN: 3831126428907
- Fitment: BMW K 1600 GT (2025–2026)
- System type: slip-on silencer pair
- Materials: titanium, carbon fibre outlet caps
- System weight: 8.4 kg (stock 11.7 kg, saving 3.3 kg / 28.2 %)
- Power: 144.0 PS (stock 142.4 PS, gain 2.3 PS at 5,870 rpm)
- Torque: 161.4 Nm (stock 159.9 Nm, gain 2.7 Nm at 5,600 rpm)
- Noise insert: included
- Road approval: EC type approval and ECE type approval
- Country of manufacture: Slovenia
FitmentWhich bikes this fits▼
- BMW K 1600 GT (2025–2026)
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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.
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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.
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