Having had two Elise and Exige I find the major SC kits and mods designed to improve known Lotus faults from BOE/Sector 111 to be more reliable then stock cars.
But really depends on how the past owner took care of the car. Example my past very modded Elise I changed all fluids, cleaned complete engine and undercar parts, checked torque and replaced any part in question. This was done after each track weekend I took a week of cleaning and the car looked like new. I have also seen other owners cars that are OEM stock that never seen the track and I look under the car and looks like it's never every been cleaned and all corroded with oil leaks.
So I find its more about the past owners care more then if OEM or modded.
Current 2007 Exige S TOURING PACK, TRACK PACK, LSD, Aspen White, BOE Torque300, Tank,2bular muffler, Larini header/Decat, RLS Intercooler, Intercooler Vent Ducts/tubes PENSKE SINGLE-ADJUSTABLE SHOCKS, CUPdiscs-Front ULTRAdisc rear, Lotus AP 4 Pot Calipers, Fidanza lightweight flywheel, ACT HDSS Clutch......way too much to list..
Past 2014 Arial Atom
Past Lotus- 2005 Elise, BOE REV400TVS,Nikasil SB, Arias pistons,....et cetera-track monster