I've heard mention that the lack of silencing in the toyo/XS system doesnt combine very well with the non-turbo engines.
I guess you'd have to try it to see for yourself though.
You also dont mention if your car is a quattro or not, if its FWD the toyo/XS system wont fit.
Jetex do a stainless system for the FWD cars as do milltek, but they're both quite expensive and TBH you'd be better off getting a local custom exhaust place to make you a system.