Extra drag? Really? I didnt realise something as thin as half a cm could do that?
Yup, anything in the airflow can create extra drag. Windscreen wipers, window seals, door handles, even bonnet emblems such as the Mercedes three pointed star can cause drag. And don't forget the base of the bee sting - much more than half a centimetre!
I checked the options for our GTi the other day when finding out about the washers and never saw a sharkfin option so not sure.
That is the concern. The "shark fin" itself was never was an option. I just think it depended on what other equipment you have fitted - such as SatNav or GSM prep. SWMBOs just has the factory SatNav, but has the shark fin, as well as the aerial elements in the rear screen. Yet my RS4 has the same spec (factory fit SatNav, no GSM), yet has no external antenna at all. Even if I had TV prep, it still uses the "diversity" antenna embedded in the rear screen.
So I just wondered why some peeps had bee stings, and few had a shark fin?