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changing the plugs because of a failed emissions test! first challenge was to find copper Bosch's - easy enough after i went to my last resort of checking with the dealer. then confronting the M104, i realized that it wasn't a no brainer as i thought it might be. fortunately, Gillybenztech gave me step by step instructions, including what sizes the nuts and bolts are and what to look out for! i was done in a half hour and passed emissions with flying colors!!!
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