I installed a set of Eibach's that are supposed to be 1.75"...by the time they settle after a few months it seems closer to 2". This is a bit extreme and you have to be careful if your are using Long-tube headers and oversized wheels and tires. I cleared my stock SS 17x9.5's with 275/40/17's just fine...however, my front air dam for the radiator rubs on some large speed bumps. I think if you lower around an 1" you shouldn't have to worry about any of these issues. If you check out my garage, you can see how it looks on a set of 18's in front and 19's in back.

 

also, if you lower drastically, you will need to get an adjustable panhard bar to compensate.

 

what is the hose mod?

pass on lowering, im raising my rear end 1.5"!!!!! gettin the pucks off summit