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hello all, just wanted to ask if someby had a similar issue. Long story short: car: 2008 e65, 82km, symptom: slow pickup at low revs, slight misfiring when trying accelerate hard but the engine is cold; solution: start with replacing sparks and coils; the problem: got 221 504 470 coils, while the original are 221 504 100. The difference is in the depth of the electrode well. The original ones (100) have a slightly deeper electorde well (by approx 3 mm), so the new ones do not sit tight. Also the engine misfired when I replaced just one coil (as a test). Did anybody have a similar situation before and what would you recommend? Thank you and happy motoring.
 
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