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Evening Gents im after some advice

Normally I like to keep everything original and STD, but I do feel the exhaust on the B7 S4 is a tad bit quiet  which leads me to the following: 
Im am thinking about getting a Miltek system fitted on my B7 S4 Avant but am unsure on a couple of things. 

I don't want to run into any issues when it comes to an MOT what's the difference between cat back / non cat back resonated and non resonated ?
Other than the obvious audible notations... 

What sort of figure (estimated) am i looking at for a Miltek System (dependant on configuration)

Also I don't want something that's going to cause issues when it comes to insurance either  

Thanks Gareth

As the name suggest a cat back is installed behind the OEM catalytic converters so it will have zero impact on the MOT.
The diiference between res and non res is loudness. Non resonated is louder.
Costs? How long is a piece of string? Use the internet and/or pick up the phone. for costs.
Some insurers will bump up your premium. Some won't. You need to ask your insurer.

i've got one going ... £350

hi mate, have a look at my channel for some videos on this, if you wanna hear it in person let me know as I am MK based

http://www.youtube.com/user/leewhiteheadmma

Lee car sounds and looks awesome, always liked the b6 s4 pity an rs version was never released. i remember some of the old TV adverts when I was working and living in South Africa very nice car.

cheers buddy, its a fully decatted, non resonated setup, its fairly loud, but oooo, the sound still sets the hairs on my neck up under load! lol

it is a shame there isn't an RS version, looks like I have to keep saving for that supercharger...