+1 to both of those recommendations. Other options off the top of my head depending on your location are Millennium Motorsport, Godzilla Motorsport and Signature Performance.Rob Bliss Exhausts - according to the white pages:
Dan from Elite Racing Developments can be contacted through his website (http://www.erd.com.au) or at sales@erd.com.au. He has a mobile but I'm not sure if he makes it public so I won't pass it on here. He's 3lit3_32 on these forums too, look him up if you're interested.