They are resistor plugs. Everyone knows that a M103 immediately explodes all over the driveway if a resistor plug is used!

I have run NGK resistors and Bosch (Germany) non resistors....and I think it runs about the same on either. However, I think the added resistance of the resistor plugs can do a number on the rotor/cap.....

I will be sticking with the normal non-resistor Bosch plugs.

As for the discontinuing....why would they do that, they must sell tens of thousands of those plugs every year throughout their dealer network, it makes no sense why they would stop making a part that is still well in demand.

Heck, I have bought 18 of them just in the past year! My current set should last a bit longer now though....since my plug oiling issue has been solved.

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