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For the amount of labor and work involved, I would not risk having to do it twice. Get the metal ones, a proven solution. 
If you go that route, I guess you can be the beta tester and see if they hold up....but that could be a few years until we know for certain...
EAC Tuning will perform the job for you (2003 E39's), but if you cannot budget for the parts, I doubt you want to pay for their expertise/labor too.
If you go that route, I guess you can be the beta tester and see if they hold up....but that could be a few years until we know for certain...
EAC Tuning will perform the job for you (2003 E39's), but if you cannot budget for the parts, I doubt you want to pay for their expertise/labor too.
