iv a standard 8v exhaust from vag and its nearly silent when plodding along, with a nice low growl when under load. it has the best tailpipe design, and from changing it from the previous owners 'stainless performance exhaust', it is more responsive.
i had a supersprint race exhaust one box system on my mk1, and when running rich it used to spit out flames and was uber loud, but amazing build.
i had a full milltek exhaust and manifold and sports cat on a mk4 1.6 fiesta zetec s, and that was lovely. amazing build, quiet on tickover, and made it presence felt when under load.very raspy, and made 19bhp on before/after rolling road. i stress again, amazing quality, but £Â£Ã‚£
imo, full standard vag system, or as said before vag backbox, supersprint centre and middle sections. dont even think of gsf/ecp exhaust parts. just dont.