Arrow 71878AKN Race-Tech Dark Aluminum Approved Slip-On Exhaust – Benelli TRK 502 (2017-2020)

The Arrow 71878AKN exhaust is a Race-Tech line slip-on with a "Dark" aluminum body, carbon fiber end cap, and stainless steel silencer internals, designed for the 2017-2020 Benelli TRK 502 Euro 4. It is ECE approved, making it road legal, weighs 2.1 kg, and comes with a dB-killer. Product code 71878AKN.

✓ Strengths

• ECE Approved – the official Arrow diagram marks it as ECE HOMOL.: it can be used on the road and passes inspections.
• “Dark” Finish – black painted aluminum with carbon fiber end cap and steel clamps: this is the dark version of the Race-Tech.
• dB-killer Included – the noise reducer is provided with the exhaust.
• Welded Mount – the attachment to the frame is integrated into the silencer body, without additional clamps.
• Manufacturer Declared Measurements – 300 mm body, ø 54 mm inlet, ø 50 mm outlet, 2.1 kg.

Technical specifications

Vehicle compatibility

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

Products listed in the catalog

• 71689KZ – approved catalytic mid-pipe, the choice to remain street legal
• 71689MI – racing mid-pipe
• 71878AK – the same muffler in natural aluminum finish, which Arrow has discontinued

Who it's perfect for

For those who own a 2017-2020 Benelli TRK 502 and want to lighten and darken the tail without losing homologation: the original TRK silencer is large and heavy, the Race-Tech Dark is more compact, weighs 2.1 kg, and with the 71689KZ catalytic mid-pipe, it remains a street-legal system, with a fuller but contained sound thanks to the dB-killer.

Frequently asked questions

Is the Arrow 71878AKN approved?
Yes. The official Arrow diagram for the Benelli TRK 502 marks it as ECE HOMOL.: the muffler is approved for road use and does not compromise inspections, provided it is fitted with the approved catalytic mid-pipe 71689KZ and the dB-killer is in place.

Is just the muffler enough, or is the mid-pipe also needed?
The mid-pipe is also needed, which is not included. The Arrow catalog provides for the 71689KZ approved catalytic mid-pipe, or the 71689MI racing mid-pipe. The former keeps the system street legal, the latter is intended for track use.

What material is it made of?
The body is made of aluminum with a "Dark" finish, meaning it's painted black; the rear end cap is made of carbon fiber, and the internal parts of the silencer are made of stainless steel. The clamps and welded mount complete the piece.

How much does it weigh and how long is it?
The manufacturer states 2.1 kg and a body length of 300 mm, with an inlet diameter of 54 mm and an outlet diameter of 50 mm. It attaches to the frame via a welded mount on the silencer body.

Is the dB-killer included?
Yes. The official Arrow technical sheet for the 71878AKN states the presence of the dB-killer: the noise reducer comes with the muffler and is the element that keeps noise within homologation limits.

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 your model and year before ordering.