Arrow 71689KZ Approved Catalytic Mid-Pipe Stainless Steel – Benelli TRK 502 (2017-2020)

The Arrow 71689KZ catalytic mid-pipe is the stainless steel link pipe, with an integrated catalytic converter, that Arrow recommends for the 2017-2020 Benelli TRK 502 Euro 4 to fit the Race-Tech silencer. It is the approved version: it retains the catalytic converter and keeps the system compliant for road use. It weighs 1 kg. Product code 71689KZ.

✓ Strengths

• It's for the road, not the track – on the Arrow diagram, it is the approved catalytic mid-pipe: the catalytic converter remains in place, and the system remains usable on the road.
• The part that makes the silencer mountable – the Race-Tech silencer for the TRK 502 has a ø 54 mm inlet, and this mid-pipe exits at exactly ø 54 mm: it is the connection provided in the catalog.
• Stainless steel – material declared by the manufacturer, suitable for the heat and mileage of an adventure bike.
• Declared racing alternative – those who go to the track have the twin 71689MI, without a catalytic converter and lighter (0.65 kg vs 1 kg).

Technical specifications

Vehicle compatibility

The list is taken from the official Arrow spare parts catalog. Always check your motorcycle model and year before ordering.

Products provided by the catalog

• 71878AKN – Race-Tech "Dark" aluminum silencer with carbon end cap, ECE approved
• 71689MI – the same central link pipe in racing version, without catalytic converter, 0.65 kg
• 71878AK – the natural aluminum Race-Tech silencer, which Arrow has discontinued

Who it's perfect for

For those who install an Arrow silencer on their TRK 502 and want to remain compliant: this is the part that allows mounting the Race-Tech while keeping the catalytic converter, thus ensuring road legality and inspection readiness. It's the choice for those who use their bike daily and for travel, not just on the track.

Frequently asked questions

What exactly is the 71689KZ?
It is the central pipe of the exhaust system, located between the headers and the silencer, and contains the catalytic converter. For the Benelli TRK 502 2017-2020, Arrow provides it to mount its Race-Tech silencer while keeping the system approved. It weighs 1 kg and is made of stainless steel.

Is the silencer also included in the package?
No. This code is for the central link pipe only. The silencer is a separate purchase: for the TRK 502, the intended Arrow silencer is the 71878AKN Race-Tech in "Dark" aluminum with a carbon fiber end cap.

What is the difference with the 71689MI?
The 71689MI is the racing link pipe: same function and diameters, but without a catalytic converter, and it weighs 0.65 kg versus 1 kg. The 71689KZ is the catalytic and approved one: it is the choice for those who want to keep their bike road legal.

Does this mid-pipe keep me approved?
Yes, that is the purpose of this code: on the Arrow assembly diagram, it is indicated as an approved catalytic mid-pipe. Combined with the Race-Tech 71878AKN silencer, which is also ECE marked, the system remains usable on the road.

What are the inlet measurements?
The manufacturer declares an inlet diameter of 43 mm and an outlet diameter of 54 mm. The 54 mm is exactly the inlet diameter of the TRK 502's Race-Tech silencer: the two parts are designed to be coupled.

Will it fit my TRK 502 X?
No. This code is dedicated to the TRK 502 Euro 4 from 2017-2020, Arrow vehicle type P16. For the TRK 502 X and subsequent years, the Arrow catalog provides different codes: check the model and year before ordering.