On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
The center box which you still have is responsible for most of the silencing.
If you replace it with a straight pipe the car will be very loud if you have removed the other 2 boxes.
I would fit a ragazzon silenced center box. If you look on Alfisti.net thet sell 2 types, a larger one and a smaller one.
The small one may also be too loud if you have no other silencing. It depends on what you want really.