I would recommend putting speakers in the parcel shelf behind.
I had a company build a custom enclosure that dropped into the existing gap(so reversible) with some 6x9s and an amp in there.
If you fit the speakers on the front edge of the custom enclosure the roof folds out the way (depending on roof style in the s1 of course..
With s1s bordering on becoming collectible I'd be a bit shy of chipping holes personally. You could also do the other obvious mid and remove the tyre pressure monitor and click and fit tweeters in the holes. Well known factory mod - and given the Tpm system is rarely useful its quite a practical solution. (Only works one side though - you'd need a pod on the passenger side given the asymmetric dash...)
Last edited by mr_tony; 09/10/13 04:02 PM.
