Like many - My [2001 reg] C5 was a basic spec model, enough toys to keep me happy, and a low price to keep SWMBO happy too ... However - after time, the single-line dash display (radio chan + time only) was starting look rather dated, so on to ebay I went :) Got an "écran multifunction B" (the multiline display) - and swapped it in, a simple operation involving removing the cowelling (a flat blade gently inserted at the left and rightmost 'corners' of the hard plastic - there are two retaining lugs that will pop out .. The display then unscrews (two Torx T20 screws) and slides out. One quick swapover later (involving finding three functional backlight bulbs (No. 286 in halfords IIRC) and I've now got the multifunctional display including fully operational trip computer. It seems that many of the C5's functions are generic, and built into even the base spec models, and simple upgrades like this effectively increase the spec level a touch .. Next job - enable the fog lamps which, while fitted and wired up in the main headlight clusters, aren't enabled in the com2000 unit. I've a spare com2000 unit from a higher spec car (breakers yards are good !) and will have a go at swapping it in sometime over the next few weeks !) So, if your C5 is lower spec than you'd like - and you have access to breakers yards .. off with you to find some simple-to-fit upgrades ... What else have you done to the C5 to make it a little more comfortable ?