I have lowered my car 4+ inches...On Pedders Red Springs and Short Stroke Shocks and my shaft doesn't hit anything, only prob I have is clearance on the front gurads.
I payed just over 900$ for the whole lot including a camber/castor kit.
Make sure if you lower your car more than 1.5 or 2 inches u get a camber kit because you will kill your tyres otherwise. When i first adjusted the camber i ran 1 degree negative...I now run 2.5(max for the kit is like 2.8)degrees negative, and i am still not getting excessive wear.
When i first went to set the camber kit to 1 degree negative after having not touched anything since lowering it a week b4, it was running in excess of 4.5 degrees negative camber on both fronts.
Whiteline are excellent, excellent quality, excellent performance, decent price.
Apart from springs/shocks Whiteline also have adjustable sway bars at $206 each and rear upper control arms(forget the cost) for E-series Falcs.
I'm getting em both, and I can't wait.