This is an DIY for a BEL STI-R Plus install on a 2009 Audi S5. This DIY should be exactly the same for an Escort 9500ci minus the ZR4 shifters. If you follow this install, however, you should have no problems figuring that part out.
I purchaed a Beltronics STI-R Plus a few months back, replacing an windshield mounted Escort 9500ix. While I loved the 9500ix, there were a few things that bothered me with it. The obvious first was that it wasn't an integrated system but rather a windshield/visor mounted unit. The second was that it had a blue display. As we all know, Audi's interior lighting is red so the blue really stood out and you could tell that this wasn't OEM.
The STI-R Plus solved both of those issues while also delivering significantly improved performance. As this is a DIY, I don't want to get into details on the radar detector itself but search google for more information as it truely is a remarkable unit. I plan on pairing the STI-R Plus with Laser Interceptor Duals in the near future as that really complete's the ideal setup.
The only complaint I have is that I prefer the female voice on the 9500ix/9500ci over the male voice on the STI-R Plus. Anyways, let's get on with the DIY.