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      03-19-2012, 11:03 PM   #63
First Lieutenant
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Drives: 2007 328i coupe
Join Date: Jun 2011
Location: Portland, OR

Posts: 348
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Yeah, I'd also like to know WHY this should be done as a matter of maintenance and not just if any codes are triggered. What does it fix or improve ? How can you tell you might need it, short of any codes ? Rough idling is one symptom mentioned, anything else ?
328i Sports Pkg, Hankook Ventus V12 (non-RFT)
. Wavetrac LSD + M3 diff fr bshgs
. Short Shifter + ZHP M weighted shift knob, CDV delete
. M3 subframe bushings + f&r sway bars + control arms. Meyle rear toe arms
. BMW Perf: springs + v1 dampers
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