TS, personally i don't buy the above mentioned items. Besides it's expensive, it does serves the same purpose as the regular spark plugs IMO. I just buy regular sparks only, clean the spark plug tips every time change oil. Below is the pictures taken before cleaning it. DIY by soaking it in coke mixed with salt, let it stays for overnight then use steel brush to clean the spark plugs tip, adjust if necessary. this park plug has been in the engine for 20k mileage, still in tip top shape condition huh!!!

