I can only speak about my pre-luxury car days. One of the first mods I would do to any one of my previous cars (Mustang, Jeeps, Xterra ect) was replace the ignition system. Yes this was in the 90's and they were mostly USA cars but I always found HP by increasing my stock coils (16k volt to 60k volt) and changing to larger wires, slightly larger gaps and usually a MSD(multi-spark discharge) and had the dyno paper to prove it consistently along with racing almost identical cars and the proof was there. Yes the hotter/larger/multiple sparks did a better job of burning the fuel. Yes this hot ignition did go through plugs much faster but that is what happens when you want more horsepower. Everything wears out faster.

First I don't know the spec's of the stock coils and how much larger the replacement ones are 5k oem vs 10k aftermarket or 4koem vs 4500 aftermarket. I am not so sure that the newer generation ECU's will actually gain much from this. I am not sure if the computers will modify the spark curve or will not even notice the increased spark and you will get gains. I have seen these before and sense that these are more beneficial to older cars.

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500