Just my 2 cents..... Zip tie method is the easiest! Why would you want a code stored in the DME from pulling the cable in the trunk? Took me longer to find the zip tie in my tool box then to do the Mod.
The results are fantastic. A little louder nothing crazy and the car preforms the same.
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CURRENT: 2012 535I
RETIRED : 2011 135I
RETIRED : 2003 540I
RIP : 2003 M3
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