It takes time and skill to do mechanic work and you have to pay for it. Everyone sees the install pics and thinks everything takes 10 mins to complete a task like it seems it does when you watch powerblock tv. If they said $100 then i'd be worried. If you do the job yourself, are you 100% confident that you have tightened every bolt correctly and have all the other tools that you might need if you run into a problem? Just a few things to think about especially since your suspension is responsible for keeping your car saftly on the road. Ive lowered 10 camaros so far and its not the quickest project, especially when its 100*+ outside
Good luck
