I've heard good things about Mick's exhaust systems on E series cars and I have no reason to expect any different for AU. However, let me just say that you want to do some research because a good twin system outperforms the singles these days. Mick's stuff is a 2.5 inch single if I remember right.
Do a thread search on these forums and read up on pros and cons.
BA'1.5' Pursuit 290
Lightning Strike / Reflective Orange Stripes
'General' Dog - AP's German Shepherd and Best Mate - 02Dec1998-15Dec2003.
'Pepper' Dog - General's and My Little German Shepherd Sweetie - 1996?-02Apr2006.
'Sako' Dog - My Beautiful and Pretty German Shepherd - 2001?-23Aug2006.