My MK3 Gti 16v has a full Jetex system - 2.5inch stainless with Boxer style tailpipe (like Scorpion).
It has no front box, a small centre box and a rear box.
Very quiet, no probs and great quality. OK, it's louder than a factory system but nowhere near track day limits - not even close.
Depends what you want.
Hope this helps.