Have a look in the classifieds, selling a c5 tdi with a few tasteful mods: big nozzles, hybrid turbo, solid intercooler, full stainless steel exhaust, mapped to about 280 Bhp, Polibushes, new airbags, new air compressor, new suspension arms, choice of 20" wheels or 19" wheels with tyres, 20mm spacers all round, leather interior, Bose sound system, factory Sat Nav, cruise, ESP, new clutch and flywheel, etc. the list of mods is a lot longer... Drives as it should, no faults whatsoever !
