I just put coilovers on my Boxster last weekend. It's lowered about 1 1/2 inches now. I would say that the whole job took right around 8 hours but that was because I was doing everything very slowly and carefully since I have never done it on a Boxster before. I am sure that if I ever have to do it again I could do it the next time in 4 hours or less. Keep in mind though thats for a coilover change. If you are going to be using lowering springs instead than you could easily add an hour or so to change the springs. There really isn't all that much too it provided you have the right tools and have a decent mechanical aptitude. It's not really as difficult as it is intimidating. There is a really great step by step with photos on renntech.org showing how it's done. Do it yourself and save big $$$.
http://www.renntech.org/forums/index.php?showtopic=4091
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'03 Midnight Blue
18" Chromes//Drilled and slotted rotors//pedal upgrade//Alum. Door sills//KSPORT Coilovers//Short Shifter/Strut braces/Clear sides/Hard Top/Speedster humps/Intake//Leather GT3 seats/REVO chip with SPS2
'04 CLK55 AMG 367HP!
'86 944 Guards Red & MINT!
'69 911 Black
PCA Member -Northern Ohio
Cancer Survivor