Mully

I recently bought my first car being it a 1 litre black Lupo. The car is completely bog standard with VW alloys. The only thing I have noticed is the sound system is a bit naff and I plan on buying a new stereo and some speakers, The stereo situation has been sorted but I need some help and advice on some speakers to buy that would be suitable for my parcel shelf apparently 6x9's would not be suitable due to their weight etc so any recommendations I Dont fancy messing around with plywood and other materials Thanks