Welcome Firstly, why do you want to lower your car? Is it mostly for looks or is it mostly for better handling? There are different stages for suspension you need to consider. Stage1 - Springs alone about $350 installed(Better looks, slightly improved cornering too. Stage2 - Springs + Shockers, about $1200, much improved cornering. Stage3 - Coilovers - Track Whore anywhere between $1300 and $3600 depending how cheap you want to be, not necessary for street, but suitable for track work. On top of either these you can install better sway bars and strut tower braces/bars. Personally I think do suspension first. Most people are happy with just springs alone and you can get this done at many suspension places, you can Try Suspension City in North Melbourne or Protech/Bridgestone tyre centre in Oakleigh on Ferntree Gully road.