Interestingly I am in the UK ... and I have the same amp as you too. Trouble is I have 2x12" subs, so i'd need larger boxes and on box sides.

Did you have Cambridge Car Audio make the box for you or was it home build ?

Looking to buy a 2002 Beetle in a few months, either New or Ex Dem, and I'm looking at the 1.8T, so sorry I'm not going to take the car either ...

Did you upgrade the Front Speakers at all ?