If you realy must lower any car I would sugest only doing so by 1/2 an inch (13mm). Any more than this it becomes difficult to set the correct camber and caster angles. Uprated bushings are great for improving suspension control; but can be at the expense of NVH. Remember Peugeot are the only car maker that produces its own shockabsorbers (suspension dampers), they do a lot of research into spring rates and damper rates so change these and results are likely to be less than pleasing. Springs are springs imported high ticket items are no beter than locally produced items (try king springs) spring rate and ride height are the really important factors. Finaly dont cut or heat original items (some people do)or allow some dickhead at the local tyre service to try to dail-in more camber or caster this will mess up the turn in and steering feel. In short fit springs with 13mm lower ride height and same spring rate, renew any worn bushes with genuine items, have dampers checked and replace (in pairs only) with genuine items if required.