^^ good points
There are several kits on the market at the moment. Obviously the one offered by the vendor themselves retains the warranty and is the most attractive at the price point.
Anyway, GLWS OP. $7500 would sell it in an instant.
2009 BMW E92 M3 | Jet Black / Fox Red, Extended - SOLD | Akrapovic Evolution - SOLD | MS Filter | StopTech ST60 / ST40, yellow | KW CS | 90mm stud conversion | 18x10F 18x10.5R HRE R43, Continental rubber | IND appearance package incl. key delete | JL Audio 10W6v3 (2) / HD700/1, Technic's harness