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.
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E90 335i xDrive 6spd, Nav, Prem, Cold Weather, & Sports package - Msport Conversion
MHD w/ Wedge Flash, MMP Inlets, VRSF DP/FMIC, ER CP, SteveAZ LPFP
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/// 425AWHP/ 500AWTQ Mustang Dyno