I have a standard 16v system with a magnex 6x4 oval on my abf mk2. Sounds good, quiet on tickover (marginally louder than standard), no boominess whatsoever on motorway/fixed throttle position, and bit of a bark under full throttle, though the airbox is the main sound at wot. Did have a scorpion dtm stainless backbox on there before, but wasn't too keen on the 80's dtm look. That was even quieter than the magnex though, again did what I wanted it to do (looks more than noise). My opinion is to keep a standard system, and go for a box with tailpipe style you like. A full system will be v loud, just like the local saxo's fiesta's and corsa's, with their 1 litre power.. My bro has a digi 8v, with a full system on, and man that's boomy on tickover, it rattles windows when he pulls up and is so bassy its annoying..