I've an ST4 (basically the same physically).
This is nowhere near as mad as some of the guys on this site....
I bought a carbon front mudguard (previously from a 748) it fits o.k. but is a little shorter at the back end so doesn't give as much muck protection - still it was cheap.
Rough idea on prices... carbon front mudguard £90 (e-bay), rear hugger (new £100), marchesini rear wheel (e-bay) £190, Clutch cover £50, front sprocket cover £30 - Yep, sad to say I've got the ducati designs headlight about £500 with the import duty an crap - but the front end is as rough-as-a-bear's-arse so I needed to do something.
I did go for some titanium cans but changed my mind - I'd like to do some work at the back end (oo-er) also but with the cost of it might buy another bike instead...there's only so far you can go.
I'm not doing it to lighten the bike - 'cos I weigh they same as a small country, I just think it looks neater.
[Edited on 28-10-2003 by fatduke11111]