Guys for Sydney if you want to avoid the ECUTEK locked in route then I had my race car done at
http://insightmotorsports.com.au
They are at Arndel Park near Eastern Creek, top work. I won't go into my RWKW but they upped my RPM limit and made the throttle more responsive.
I paid for mine so this is not a commercial for a sponsor.. merely a recommendation based on my experience and performance gain.