Akrapovic exhaust BMW R12 S-B12SO25-HISSSBL 360° — drag me
3.21 k g
02 · Data & docs

The facts.

Technical data
BrandAkrapovic
Part numberS-B12SO25-HISSSBL
FitmentBMW R 12 and R 12 nineT (2024–2026)
System typeDouble conical mufflers, black-coated
MaterialsHigh-grade stainless steel with a lightweight titanium link pipe
Heat shieldSandblasted stainless steel, protects the rider's equipment
Weight3.21 kg (stock 3.59 kg, saving 0.4 kg / 10.6 %)
Power103.6 PS (stock 102.8 PS, gain 1.1 PS at 7,500 rpm)
Torque107.9 Nm (stock 107.3 Nm, gain 1.4 Nm at 5,200 rpm)
Road approvalEC type approval and ECE type approval
DescriptionThe whole story

Fifteen minutes. That is the shortest installation time of any exhaust part in this catalogue, and it says something about how BMW built the R 12: the silencers hang on the outside with nothing over them, and the whole job is a pair of clamps and two hangers.

Key Features

  • Double conical mufflers in black-coated high-grade stainless steel
  • Lightweight titanium link pipe — titanium where it saves weight, steel where it takes abuse
  • Sandblasted stainless steel heat shield protecting the rider's equipment
  • Laser-engraved Akrapovic logo on the muffler rather than a sticker
  • 1.1 PS more at 7,500 rpm and 1.4 Nm more at 5,200 rpm
  • Fifteen minutes to fit
  • EC and ECE type approved
  • Weight saving 0.4 kg — small, and stated as such

Neo-Retro Means the Shape Comes First

The R 12 and R 12 nineT are BMW's heritage boxers, sold on how they look standing still as much as on how they ride. Akrapovic states that the design and lines of this system were developed specifically to integrate with the bike, and the double conical shape is the visible result — tapering twice along its length rather than running as a straight tube.

The finish follows the same logic. Black coating over stainless, sandblasted shield, engraved logo instead of a printed one. On a machine bought for its appearance, a sticker would be the wrong ending.

Steel Outside, Titanium Inside

An unusual combination: the mufflers are stainless steel, the link pipe is titanium. That is the reverse of most systems, where titanium is the visible part. Here the reasoning is durability where the eye falls and weight where it does not — a coated stainless muffler keeps its finish on a bike parked outside, while the hidden link pipe gives back some of the mass.

The result is a modest 0.4 kg saving, 10.6 per cent. This is not a lightweight part and the numbers say so plainly.

R 12 and R 12 nineT

BMW splits the model in two: the R 12 is the lower, cruiser-leaning version, the R 12 nineT the roadster with more ground clearance and a sportier stance. The engine, the frame and the exhaust mounting are shared, so one set fits both.

Fitment and Compatibility

S-B12SO25-HISSSBL covers the BMW R 12 and R 12 nineT from model year 2024 through 2026. For the earlier R nineT family up to 2023 the corresponding part is S-B12SO17-HBRBL, which is a different system and needs a link pipe chosen separately.

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-B12SO25-HISSSBL
  • EAN: 3831126429836
  • Fitment: BMW R 12 and R 12 nineT (2024–2026)
  • System type: double conical mufflers, black-coated
  • Mufflers: high-grade stainless steel
  • Link pipe: titanium
  • Heat shield: sandblasted stainless steel
  • Finish: laser-engraved Akrapovic logo
  • System weight: 3.21 kg (stock 3.59 kg, saving 0.4 kg / 10.6 %)
  • Power: 103.6 PS (stock 102.8 PS, gain 1.1 PS at 7,500 rpm)
  • Torque: 107.9 Nm (stock 107.3 Nm, gain 1.4 Nm at 5,200 rpm)
  • Noise insert: included
  • Installation time: approx. 15 minutes
  • Road approval: EC type approval and ECE type approval
  • Country of manufacture: Slovenia
FitmentWhich bikes this fits
  • BMW R 12 (2025–2026)
  • BMW R 12 nineT (2024–2026)
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08 · Paddock

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