NGK spark plugs iridium IX....
 

I changed my plugs to NGK Iridium's IX.. I didn't really think i'd notice any difference...but...It actually has been a pretty good swap. I noticed more zip to my accelleration and the car seems to be more fuel efficient. Although I did just get an oil change too...As far as how much more gas mileage I'm getting..I'm pretty sure its minimal or barely noticeable..Maybe its all in my head!!:rolleyes: But i swear its not burning as much gas as it did with the the OEM plugs in..

Anyone else using some good plugs and noticed any difference after they were installed?

Cant you se the diference on BC ?
if not then there is none :)

Started using them on my E46 and now on my X5. There's more oomph on the acceleration IMO.

NGK make the plugs for bmw.and of course the new plugs and fresh oil change will make it fill better compare to the plugs that was in the car for 60k -100k miles.

Yeah..I definitely noticed more zip on accelleration..Not bad for spending 42 bucks at advance auto..I did them my self with the help of another member..Its pretty simple and definitely worth it....

:iagree: There are too many variables to draw any conclusions, especially since there were no measurements done.