You have to do the complete conversion including the TC parts, computer upgrade and reflash. IIRC the costs were north of $4000 for the complete job...if you can find a Lotus dealer who will do it and has access to the computer program. Olins seem to be one of the shocks used by the Elise guys. Go to www.lotustalk.com to get the complete picture.
Many guys just traded in the old Elise for a newer one with factory LSD after doing the cost and PITA comparison of upgrading. However, the fastest Elises at Nationals were all conversion packages of the older models, FWIW, not that the drivers had anything to do with them being fast....
Ted
2004 Z16/Z06 SS