Noise is seldom an issue for craft fitted with engine/sterndrive combinations from the same manufacturer, assuming the sterndrive has an integral exhaust (and this is used). This covers most engines from Mercruiser and Volvo Penta (which in reality is 80%+ of the market).
Craft with conventional/V-drives will however need to undergo a pass-by noise test (which we can do at extra cost) unless a slow speed craft (e.g. Trawler yacht) in which case compliance can be calculated using empirical methods.
Outboards often require separate testing too, since sourcing certification for comparable EU engines is often impossible (EU dealers view US outboards as grey imports) and in any case the manufactures will swear blind they are not the same specification.
For more information on the background and current requirements please go to the why are emissions important page.