You've linked to two cars, neither of which is a mk3. The sounds of a 4 Cylinder, a 4 Cylinder Turbo and an opposed 4 cylinder are all drastically different. Nevermind even comparing them to a 6 cylinder.
The problem that you're going to run into, is that the Mk4's have a different valve train and such which largely contributes to their exhaust note.
Edit: Kinda reminds me of a Greddy SP on a mk3, w/o a resonator.
http://youtube.com/watch?v=orhmCegWiOY
__________________
1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?