Arrow 71729MI Stainless Steel Racing Mid-Pipe – BMW F 900 R / XR (2020-2024)

The Arrow 71729MI is the mid-pipe from the Arrow exhaust line for BMW F 900 R, F 900 R A2, F 900 XR and F 900 XR A2 from 2020 to 2024 (Euro 5, vehicle type 4R90 · 4R90R). It is the pipe that connects the headers to the silencer: it fits both the original BMW headers and the Arrow 71730MI racing headers. Part number 71729MI, EAN 8019799108615, weight 1.12 kg.

✓ Strengths

• Also fits original BMW headers – the Arrow mounting diagram explicitly states this: there's no need to change the headers as well.
• It is the mid-pipe designed for all six Arrow silencers for the F 900 R / XR 2020-2024, both Indy Race and Pro-Race.
• Stainless steel – corrosion and high-temperature resistance.
• No lambda sensor bung and no db-killer – it is a free-flowing mid-pipe, designed for racing configuration.
• 1.12 kg – weight declared by Arrow.
• Also covers A2 versions – F 900 R A2 and F 900 XR A2.

Technical features

Arrow does not publish body length, inlet diameter, and outlet diameter for this code: the three fields in the official data sheet are zero, so we do not report them.

Vehicle compatibility

The list is as declared by Arrow for code 71729MI. Always check your motorcycle's model and year before purchasing.

The Arrow system for this motorcycle

On the Arrow diagram, the 71730MI headers are connected to the mid-pipe by a dashed arrow: they are optional, the 71729MI also works with the original headers. The silencers, however, are connected by a solid arrow.

Who it's perfect for

This is the part for those who install an Arrow silencer on the F 900 R or F 900 XR and want to free up the exhaust system on the track: the mid-pipe eliminates the original section between headers and silencer and allows the engine to breathe. Those who need to remain road legal, on the other hand, install the Arrow ECE approved silencer only on the original mid-pipe: the bike remains compliant, and the 71729MI is kept for track days.

Frequently Asked Questions

Is the 71729MI mid-pipe street legal?
No. On the official Arrow website, it bears the Racing badge: it does not comply with any regulations, is not approved for road use, and can only be used on closed circuits. By installing it, the exhaust system is no longer street legal, even if the paired silencer is ECE approved.

Which BMW models does it fit?
BMW F 900 R, F 900 R A2, F 900 XR and F 900 XR A2 from 2020 to 2024, vehicle types 4R90 and 4R90R. These are the applications for which Arrow indicates this code.

Does it fit original headers?
Yes. The Arrow mounting diagram explicitly states this: the 71729MI mid-pipe fits both Arrow headers and original BMW headers. You are not obliged to buy racing headers as well.

Which Arrow silencers is it compatible with?
With all six intended for this motorcycle: Indy-Race 71915PK, 71915AK and 71915AKN, and Pro-Race 71915PR, 71915PRI and 71915PRN. They are all ECE approved, but when combined with this mid-pipe, the system remains for racing use.

Is it suitable for the F 900 R or F 900 XR from 2025?
No. From 2025, Arrow treats the F 900 R and F 900 XR as a different application, with vehicle types MR90 and MR90R and their own codes. This mid-pipe only covers the years 2020-2024.

What is the difference between the 71729MI mid-pipe and the 71730MI headers?
They are two different parts of the same system: the 71730MI headers replace the section attached to the engine head, while the 71729MI mid-pipe replaces the central pipe between the headers and the silencer. They can be installed together or separately – both are for racing.