For my opinion,
If u are running with stock cable plug, I dun think so those aftermarket spark plug can provide u
extremely high sparking. Maybe few percent, but not until "n" time or 200% etc.
Unless those spark plug built with amplifier @ booster inside.

U can get a high sparking even though from stock spark plug when u replace with aftermarket low resistance cable or
upgrade on ignition firing system.
U can do an experiment with method below if u have those parts ( Demo from workshop one ).
1. Ignition coil
2. stock plug cable
3. low R plug cable
4. stock spark plug
5. platinum / Iridium spark plug.
Just join the spark plug cable with ignition coil and plug in the spark plug, connect the supply with 12VDC.
Just check on the sparking with :
1. Stock plug cable vs low R plug cable with stock spark plug
2. Stock plug cable vs low R plug cable with platinum / Iridium spark plug.
Of coz, after increase on sparking rate, spark plug tool life will be shorten.
Therefore, people go to aftermarket spark plug like platinum & Iridium
to gain better tool life and sparking stability.
So, if ur car engine still in stock, changing aftermarket spark plug will not give u in big change,
just very very minor only.
In the other hand, heavy mod in ur engine, u need to select correct rate / range of spark plug to gain stability sparking.
correct me if I wrong.
