The facts behind the Euro 4 standard for motorcycles

All new models of 125 cc and up must comply with the Euro 4 regulations as of the 1st of January 2016. For existing Euro 3 models manufacturers have two options: either they adjust the model in question before the 1st of January 2017 to create a Euro 4 model or they catalogue the individual model as a predictive model and they have until the 31st of December 2018 to sell their stock -under certain conditions-.

This means that the dynamic noise must be reduced by Euro 4 with a few dB (A). Your Euro 3 muffler was allowed to make up to 80 dB (A), this is now reduced to 77 dB (A).

The well-known (removable) Db-eaters are not allowed anymore. A Db-eater must be permanently attached now, so that you have to seriously damage your exhaust to remove the Db-eater. The widely used excuse to the police: “Sorry, my Db-eater was really installed and must have fallen during the ride!” is no longer possible!

And then, the electronically controlled valves. This may be used, provided that they always work properly and are not installed with a ‘test cycle’ recognition. Electronics can recognize a ‘test cycle’ and then switch to a special program in which the valve closes and thus is suddenly much quieter. In the media, this software has become known as the ‘tamper software’.

For us as an exhaust manufacturer any new standard means a new set of challenges. Besides all modifications to produce a beautiful and better sounding exhaust, inspections have become more complicated and a costly procedure. Each new exhaust undergoes a rigorous and extensive sound test on special asphalt at the TÜV authority Papenburg in Germany, before any (type) approval is given.

And perhaps you did not know it yet. As of 2020 the even stricter Euro 5 standard for all motor vehicles will be introduced.

Easy webshop ordering is now available wherever you live!

All our exhausts can be ordered from the convenience of your own home! Just press the ‘to the webshop’ button and you will go to our webshop.

You can order the perfect exhaust for your bike, day our night. And if you might live in a region where our webshop doesn’t deliver, please contact our head office in the Netherlands and we will do our best to find another solution.

Proud to be part of the BMW Scrambler project by Van Harten Performance!

Old times not only relive, but also converge with contemporary essentials in this BMW R nineT Scrambler project.

The result is amazing looking, strong and solid bike and a fantastic exhausts system.

He’s back:
The Honda CRF1000L Africa Twin

After many years of waiting, the 2016 Africa Twin finally arived! Thirteen years after the original model went out of production, Honda has resurrected the legendary Africa Twin. A beast of a bike that looks like it was born during a desert race.

The new Africa Twin is powered by an all-new 998 cc parallel twin motor. They used the same four-valve Unicam head design in their competition dirtbikes (the CRF250 and CRF450). The choice to go with the P-Twin over the V-Twin was made early on because it helps with centralizing the weight. And more with keeping the motor compact and slim. But that’s not all… Already Bos Exhausts has made an amazing and perfect exhaust for this bike! Check out the features on our products page.

Bos Exhausts at
Motorräder 2017 Dortmund

As you might know Germany is one of the most important export countries for Bos Exhausts. Therefore, we decided to skip the Motor fair in Utrecht at least for this year.

Instead, you might have found us at the Motorräder 2017 Dortmund. Thank’s for your visit!