Hi:

Would someone please advise me on the best performing plugs for my 99 540? I don't mind if I have to change them once per year. My experience is that platinum, while lasting a long time, does not perform as well as copper, and that iridium is the best performing, but at $6+ per plug, may not be worth the money.

Any experiences out there?

I went from Bosch to NGK and recorded a 12 hp RWHP gain on the dyno.Just call Erick at Edge Motorworks(great people) he turned me on to the plugs.

I went from Bosch to NGK and recorded a 12 hp RWHP gain on the dyno.Just call Erick at Edge Motorworks(great people) he turned me on to the plugs.


what are the part #'s for the plugs? exact name or whatever would work... i need new plugs for my car soon.

I didn't know it was possible plugs would give you 12 rwhp. Were your existing plugs in that bad of shape before??

I didn't know it was possible plugs would give you 12 rwhp. Were your existing plugs in that bad of shape before??

No they were in good shape.I know it sounds strange but it is the truth.Call Erik.I dare you. :)

No they were in good shape.I know it sounds strange but it is the truth.Call Erik.I dare you. :)


exactly what plugs were they again?

Bosch aus der Vaterland.

Thanks:

I will call Edge on Monday. NGK makes copper, platinum and iridium plugs for my car. Do you recall which material you went with?

NGK Iridium for n/a cars.