Well, if it's anything like my Golf, it'll be straight forward. There isn't enough room in the DIN slot, this much is true, but have you tried behind the passenger glove box? If you reach below the glove box, can you find a bit of material screwed to the underside? You should be able to pull this away and install the tuner above this. It's pretty easy to run some wires from the DIN slots to here. Actually, I found a nice little gap in behind dash above this piece of material and wedged the tuner in there. Took me about 5 minutes to install the tuner, and run the wires up to the Empeg.

I'm sure there's somewhere to put it, without resorting to cutting up air vents or anything.

Paul