I made most of my system up from jetex parts, its two inch and has one minimal silencer (3" dia 18"ish long). Its real nice now, not too loud at low revs (gentle burble) but sounds like its going to chew your ears off when you push it hard. Its in a range rover but im sure you could do it in 90.
If i had time and money i'd up the bore slightly maybe to 2.5 or 3", reckon that would make the burble better. Possibly with a slightly bigger silencer for more back pressure.
Also if you mess about with it a lot it may want a re-tune
Nick