I was originally quoted $800 to install dp's and a fmic from a shop... I went to another and paid $750 for dp's, 7" fmic, brake rotors, brake pads, ss brake lines, and brake fluid. I think $400 is definitely a fair price.
< Click picture for photoshoot
E90 335i xDrive 6spd, Nav, Prem, Cold Weather, & Sports package - Msport Conversion
Cobb V3 w/ Motiv Tune, VRSF DP/FMIC, ER CP, Roc-Euro DCI, SteveAZ LPFP & more
More Pictures: Build Thread
/// Shop I use: Aci Dynamix 408AWHP/ 483AWTQ Uncorrected Mustang Dyno