I have a 2005 E46 318CI with the N46B20 engine.

I'm getting some parts on mister-auto.ie but I'm confused about the spark plugs

when I put in my reg number, it give me a few different types of spark plugs that it says will fit. There are some serious differences in the prices though.

The Bolk ones are very cheap, are they any good ?

from my research this page says that I need:

IZFR6H11 - NGK Iridium Spark Plug (4294)
http://sparkpluglist.blogspot.ie/2012/07/bmw-spark-plug-reference-guide.html

seems like overkill ????? I'm only saying that because the NGK website says that these ones are for "performance engines" and the fact that this ones don't come up on mister-autos list