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      03-20-2012, 12:03 AM   #63
DaanBMW
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Drives: 2007 328i coupe
Join Date: Jun 2011
Location: Portland, OR

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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 ?
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328i Sports Pkg, Michelin PSS on Staggered 18" OZ Ultraleggeras
. BMS Powerbox. Cyba scoops + charcoal delete. Wavetrac LSD
. M3: subframe bushings + sways + control arms. Meyle rear toe arms. M3 diff fr bushings
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. Short Shifter + ZHP M weighted shift knob. CDV delete.