B9 7in DIS retrofit

[ian.f]

Hi Forum!

im looking at getting myself an A4 avant, TDI auto, either SLine or Ultra sport (150 or 190). 

Been looking for a few weeks now and I’ve noticed that some have upgraded DIS from the standard 5in monochrome to the 7in colour. 

Typically, (as I’m buying 2nd hand) I can’t find any that have the other spec ‘bits’ I want, as well as the 7in DIS. 

I was wondering if this could be retrofitted, and if so would it cost a bomb to do?

Thanks to anyone that can give me any info!