The Dinan S2 Kit is $4728 US for the following ...
Stage 5 Engine Software; Boost Upgrade System; High Flow Cowl Induction Intake; High Flow Throttle Body; Free Flow Exhaust; Strut Tower Brace; Stage 3 Suspension System; Signature Floor Mats; Dinan Deck Lid Badge; Serial Numbered S2 Plaque.
The above price doesn't include the cost of fitting the kit which takes 199 labor units or almost 20 hours
Source: http://dinancars.com/Mini.asp?Series...is=40&Model=91