57i - where to buy?

[stove]

All,

I am about to buy Elises Xmas present in the form of a 57i induction kit, purely due to complaints from passengers on the lack of decent engine noise (and before you say it, I am aware that it doesnt improve power much in the E).

Can anybody recommend the best ie. cheapest price they have seen on the net or otherwise to purchase one of these kits?

many thanks