So I've decided that rather than go for another performance mod to do something totally different next.
http://www.kleinn.com/products/102.htm
http://www.kleinn.com/products/6250.htm

Anyone have idea for mounting location? I was thinking of doing it in the back of the car under where the boot is but I'm not sure. I haven't bought the system yet or have the car up in the air to test clearances. Just a feeler at the moment.
The only major problem I see about the back, assuming clearance isn't an issue, is that the nipple for the wiring to go to a switch inside is under the bonnet and I would need to tie up a lot of wire to get from the back, into the bonnet, then into the car. Is there and rear mounted grommet I could use?

 

Mods, please delete. Did not realize I had chosen 1st gen. Thank you. I have reposted in 2nd gen.