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Depends entirely on how much mileage you are doing and also if its long journeys or short trips. About a month is a good average. As justin saidm the sound will change slightly and probably be a bit louder
The name 'group n' is just that, a name! its not associated with rally cars in anyway. iirc it is the map best suited to cars with aftermarket exhaust and induction.
Cheapest I can put together for you is:
http://www.motor-world.co.uk/show_prod.php?prod_id=12425
http://www.motor-world.co.uk/show_prod.php?prod_id=12434
http://www.motor-world.co.uk/show_prod.php?prod_id=10533
Total of £55 ;)
and then you can add a head unit for £43...
Maxogen if you want the best of the best.
Viper is very good
Simota gets good reports but not very many of them
Hillpower same as the simota, seemed to be exceptionally popular for a while though
DIY Maxogen, espace v6 airbox or ph1 172 with ITG panel filter and custom air feed, good cheap...