Sport Auspuff – Installation

I soon wanted to afford a sports exhaust for my SAAB 9-3. Now the question arises, what kind of variant (type of construction)? Complete system, rear silencer, right-left system, double exhaust, single-pipe exhaust, one-sided or middle-seated exhaust? What kind of tailpipe – shape, such as oval, square, or round? Sound sporty dull or rather similar serial exhaust? Then there is the next problem, for the sports limousine there are not many offers. Would you be grateful for a few suggestions. , addresses and pictures. What kind of installation do you have under it?