apparemment pas si simple ...
Chez BMW personne n'a été capable de me répondre, alors que j'ai donné le n° de chassis.
Mauvais volonté? Incompétence ?
Pareil là où j'ai acheté les bouchons (http://www.pmwltd.co.uk/), le mec m' a conseillé de démonter car c'est la seule manière de savoir.
La réponse du mec:
Thank you for your enquiry regarding the well documented swirl flap issue on your diesel BMW. Vehicles with a build date of 2003 onwards will have been fitted with either a 22mm or 32mm swirl flap diameter. The only way to establish what sized swirl flap is fitted to you vehicle is by visual inspection only. We have seen vehicle’s as late a 2009 with the 22mm sized swirl flaps fitted. Also, we have seen the 32mm swirl flaps on vehicle’s as early as February 2003.
Fred