There are a few techniques that owners have employed to reduce road noise and vibration in an elise - particularly useful when driving long distances on motorways.
Good ideas include:
1) Fit carpets, as seen in the Touring Pack.
2) Apply patches of noise deadening material to the internal body panels. This is heavy, self-adhesive material that reduces panel vibration, but does not provide sound insulation. Best results are obtained by attaching small pieces to the middle of each panel (e.g. 1 patch under each seat).
Sources of deadening material include:
3) Stuff a bin liner filled with loft insulation behind the front wheel arch liners via the front service compartment. This reduces road noise.
4) Get a "proper" car :)