I need to get my rear spoiler, underbody air diffusers, and front lip installed for my 05 coupe. The dealer wants to charge $300 for the install. Are there any shops in OC that can do as good a job on the install for a cheaper price?

Also, I haven't bought the parts yet but I plan to get them from Everything G35. I can get all those parts from them for $800 shipped. Is this a good deal for OEM parts?