Autobahn Performance in Peabody ma, there shop is very very clean and they always have many porsches around as they mostly work on them. i know a tech there let me know if you end up going ill let him know.
http://www.autobahnperformance.com/
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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