You absolutely need sound deadening. The doors will need a speaker pack each and the boot will need a trunk kit. The more sound deadening you have in the boot floor, rear quarters and bootlid the more bass will come toward you and not out via a rattly numberplate and in to nothing.
I would suggest two speaker kits (£15 each), a wedge pack (£130 for the whole boot), dynaliner to help eliminate rattles, and a few spare sheets for inner skins etc. Look to spend a good couple hundred if going the Dynamat Xtreme route all in.
You could look at other manufacturers such as brownbread who are roughly the price and allegedly just as good
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Previously: 2003 Peugeot 206 1.6 8v | 2006 E90 320d M-Sport, 19" BBS CH, Full Ice-cold JL audio install, August 2010 Total BMW 6 page feature car. | 2003 Nissan 350Z GT Coupe 286BHP
Now:2010 E92 LCI 335d M-Sport
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