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      02-25-2010, 03:40 PM   #3
SV Concepts II
 
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Drives: E90 M3
Join Date: Dec 2008
Location: 1460 White Oaks Rd. Suite F Campbell, CA 95008

Posts: 6,095
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Not necessary, but very beneficial if possible. A custom tune will always yield better results than "canned" tunes. However these tunes (AA, ESS, etc) can adapt (somewhat) to minor mods.
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