Difference between approved and non-approved (racing) Exhausts: a guide for custom bikers and café racer enthusiasts

If you're passionate about custom motorcycles or café racers, sooner or later you'll face a choice: go for an approved Exhaust or a racing (non-approved) one.
This decision isn't just about performance, but also affects looks, sound, and how you experience your bike.

In this guide, you'll discover the key differences between the two types of Exhaust, along with useful advice to help you make the right choice for your needs.

What does approved Exhaust mean

Approved Exhausts are certified for road use.
This means they comply with noise and emissions limits set by European regulations.

• They carry a visible approval mark (often “E” or “CE”)
• They're designed to ensure safety, reliability, and compatibility with your motorcycle
• You can ride with them without risking fines

Additionally, compared to stock Exhausts, approved versions are also lighter: this improves the bike’s handling and agility, without sacrificing legality.

What does non-approved (racing) Exhaust mean

Racing Exhausts aren’t certified for street use, as they're mainly designed for track days and private events.

Still, many riders choose them for:

• Design: more freedom and an aggressive look, created to enhance your bike’s style
• Sound: deeper, more distinctive and personal, making the riding experience even more engaging
• Lightness: here too, compared to OEM Exhausts, racing models are lighter and boost overall performance

Important note: since they're not approved, they're not intended for everyday use on public roads. However, they're a popular choice for those seeking a unique experience on track or at gatherings.

Main technical differences

Here’s a clear comparison between approved and racing Exhausts:

• Legality: approved models are fully road-legal, racing ones are for track and private events only
• Sound: approved exhausts have a more balanced tone, racing ones are freer and more aggressive
• Performance: racing versions deliver more at high revs, while approved models ensure reliability on the road
• Weight: both are generally lighter than the stock Exhausts, improving agility and comfort

Which Exhaust to choose for a custom or café racer

The choice depends on the style you want for your bike.

• If you want a sleek, street-legal look, go for a certified Exhaust that combines aesthetics and practicality
• If you're after a more aggressive sound and a unique character, opt for a racing model (ideal for track days and events)
• Many custom riders choose homologated Exhausts with removable db-killer, giving you two personalities: discreet on the road, bold on the track

Exhausts Mass Exhaust and Zard: the right choice for custom and café racers

When it comes to Exhausts for custom and café racer motorcycles, two Italian brands stand out: Mass Exhaust and Zard.
Both represent excellence, but with different qualities that make them ideal for different needs.

• Mass Exhaust: craftsmanship, dedicated design, and a strong focus on the custom and café racer world. Perfect for those who want a unique look and an engaging sound.
• Zard: innovation and performance, with more modern lines and technical solutions designed to enhance power and reduce weight. Ideal for those seeking a balance of style and performance.

Both brands offer Exhausts that are lighter than stock, made from premium materials like stainless steel, titanium, and carbon fiber, capable of transforming the character of your bike.

Discover Mass Exhaust Exhausts Discover Zard Exhausts

Frequently Asked Questions

Do homologated Exhausts still sound good?
Yes. Especially those from premium brands like Mass Exhaust and Zard, which combine legal compliance with distinctive sound.

Are racing Exhausts illegal?
They are not intended for street use, but are perfect for the track and private events.

Are aftermarket Exhausts lighter than the originals?
Absolutely: both homologated and racing versions are lighter than stock Exhausts.

Do I need to remap the ECU if I change the Exhaust?
It depends on the model: for racing parts, it’s often recommended; for road-legal ones, generally not.

Does a café racer look better with a short or long Exhaust?
It’s a matter of style: short ones highlight aggressiveness, long ones give a vintage elegance.

Conclusion

The choice between homologated and racing Exhausts isn’t just technical—it reflects your philosophy as a rider.
Want to ride worry-free? Choose a homologated version.
Looking for maximum sound and character? Then a racing model can deliver a unique thrill, on track or at dedicated events.

If you’re after the right balance of style, quality, and true custom spirit, check out the collections from Mass Exhaust and Zard to find the Exhaust that will make your bike stand out.