Mitch & Deb from WA Performance - can't recommend them enough!!
They do all the work on my VX GTS and they have some very quick cars in their stable. Mitch is the no bullshit approach, if you don't need it on your car, he'll tell you.
They're at 8 Macewan st Leederville (opposite Strathfield), or have a look at their website
www.waperf.com
When you're there have a look at his turbo charged SS - went for a spin in it and OMFG....that thing has got some grunt...
Cheers
DRex