Nelson Paxton supercharger 911 !!!!!!!
 

I ve put this on my S5 13b but the belt I have doesn't fit . I have a oversized supercharger pulley and no more air pump . I would need the sizes of the alternator to water pump belt and the one that goes on the main pulley that makes the supercharger and the alternator turn .

Thanks

Go to store and have them do the string thing, they'll give you a size.