Not necessarily so. It depends on which EU country the Type Approval certification was done. Germany are generally acknowledged to be the strictest in terms of adherence / interpretation of the regualtions and Spain somewhat more lenient. What this means in practice is that German testing authorities want every exhaust testing on every bike, whereas Spain will test an exhaust / silencer on one bike and allow the certification for that silencer to be used on various other bikes. Meaning, some identical silencers will run louder on some bikes than others. For this reason, you will find that many exhausts aren't tested in the country of manufacture but elsewhere, where regulations are less stringently interpreted.