OK I've just had my wizrd fitted to my 1.8 TS 156. Verdict..... amazing!
Fits perfectly with no hassle (took about 40 mins to get the old one off, very little adjustment needed to get it sitting perfectly in the original apperature). The quality is better than anything I've seen before, its a beautifully made exhaust. Finishes off the back perfectly!
Lovely deep note with a bit of rasp, not over the top while idling or at low revs. Put your foot down and you get a nice growl, rev it to around 5 and you get a higher pitched rasp that they're known for.
I will try and get a video on youtube at some point, couldn't find any wizrd on 1.8 vids on there atm. Don't let this put you off, they sound great on 4pot engines too!