i asked the same question a few days ago
its probably not worth it,you need the steering rack,the column,the steering wheel,and the sei stalks,the power steering control box,and the power steering box thing,
then you have to find a way of getting it all to work properly with a cinq,
really not worth the hassle.besides the steering is light enough isnt it?
if not,go pump your tyres up and notice the difference