⟲ 360° — drag meThe facts.
| Brand | Akrapovic |
|---|---|
| Part number | E-B13E1 |
| Fitment | BMW R 1300 GS, GS Adventure and R 1300 R (2023–2026) |
| Part type | Optional header — pairs with the Slip-On Line (Titanium) |
| Materials | High-grade titanium with a carbon fibre heat shield |
| Weight | 2.97 kg fitted against 6.24 kg standard |
| Torque | 5.9 Nm more at 3,000 rpm — just off idle on a boxer |
| Design | Larger tube diameter than standard; catalytic converter removed |
| Installation | One hour of workshop time |
| Road approval | None — closed course competition circuits only |
DescriptionThe whole story▼
5.9 newton metres at 3,000 rpm. On BMW's new 1300 boxer that is barely above idle — the rev range where a loaded GS pulls away from a junction — and it is the figure that justifies a header on a touring machine.
Key Features
- 5.9 Nm more at 3,000 rpm, low in the working range
- 4.2 PS more at 7,800 rpm, output reaching 146.9
- 2.97 kg fitted against 6.24 kg standard
- High-grade titanium with a carbon fibre heat shield included
- Larger tube diameter than standard, catalytic converter removed
- Pre-muffler tuned for a deep boxer racing tone
- No road approval — closed course circuits only
A Note on the Two Weight Figures
Akrapovic's description states a 54.84 per cent reduction of 3.4 kg. Its own technical data for the same part gives 6.24 kg standard and 2.97 kg fitted — a saving of 3.27 kg, or 52.4 per cent.
The two do not quite agree. We use the structured data because it names both endpoints and can be checked, and we mention the description's figure so nobody thinks we mistyped it.
Either way the answer is the same: roughly half the weight of BMW's header assembly, and more than three kilograms off the lowest part of the motorcycle.
The Heat Shield Is Included
A carbon fibre heat shield comes with the header. On a boxer, where the exhaust runs along the outside of the cylinders at knee height, that is not a decorative item — it is the part between a hot header and the rider's leg.
Peak Torque Barely Moves
145.7 Nm standard, 145.6 fitted. The peak is unchanged in any meaningful sense; the 5.9 Nm is the gain measured at 3,000 rpm.
That is the correct result for this kind of part on this kind of engine, and it is worth stating plainly rather than quoting only the larger number.
What Removing the Converter Buys
The larger tube diameter and the absent catalytic converter together produce the gas flow the figures come from. They also produce the sound — Akrapovic describes a deep racing tone from the boxer — and they end any possibility of road approval.
An Hour, Because It Is a Boxer
A boxer's cylinders point sideways, so the exhaust ports sit in the open rather than buried under a fairing. Sixty minutes is short for a header, and on the R 1300 it stays short — BMW kept the layout accessible even while adding the new engine's extra complexity.
The R 1300 R As Well
BMW's naked R 1300 R shares the engine and the exhaust route with the GS. Both take this header, which on a part at this price makes the fitment list worth reading twice.
Fitment and Compatibility
E-B13E1 covers the BMW R 1300 GS, the GS Adventure and the R 1300 R from 2023 through 2026, and pairs with the Akrapovic Slip-On Line (Titanium) for these machines.
Road Approval
None. Intended exclusively for closed-course competition circuits.
Specifications
- Part number: E-B13E1
- EAN: 3831126435820
- Bikes covered: BMW R 1300 GS, GS Adventure, R 1300 R, 2023 to 2026
- Type of part: optional header in titanium
- Included: carbon fibre heat shield
- Weight: 2.97 kg fitted, 6.24 kg standard
- Power: up to 146.9 PS from 143.2 standard, read at 7,800 rpm
- Torque: 5.9 Nm more at 3,000 rpm; peak essentially unchanged
- Requires: Akrapovic Slip-On Line (Titanium)
- Workshop time: about an hour
- Approval: none; closed circuits only
- Country of manufacture: Slovenia
FitmentWhich bikes this fits▼
- BMW R 1300 GS and R 1300 GS Adventure (2023–2026)
- BMW R 1300 R
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