Does anyone know how big mid-bass speakers you can fit in a mini?

Without very special mods?;)

Thanks.

You can get a 165cm in the doors no problem :). See one of our sponsors web site for
details, www.newministuff.co.uk. I made something the same in wood with a jigsaw
if you feel it's expensive with postage. Anything bigger takes a lot more effort.

I went with the Polk Momo 6" component series in the front on my S.