Ace Performance Systems, 860 East Street, Tewksbury, MA 01876
http://www.aceperformancesystems.com/contact-us
or Turner Motorsport,16 Hunt Rd. South in Amesbury, Ma
http://www.turnermotorsport.com/t-about.aspx
or Bavarian Performance Group in Winchester
http://bavarianperformancegroup.com/
i Have used all three, i know Turner offers loaner cars which is nice, im not sure about the rest but if your having something major done it defiantly helps.
good luck
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07 e90 335xi- Sold, 09 X5- Sold, 12 e92 335 xdrive - Sold 11 e92 M3- Sold, 15 M235-Sold,07 e90 335xi (current daily), 10 Atlantis e92 M3 (current) Way to many mods to list