Spark plugs for ML55.

[CHRISCHANCE]

I've been online shopping for Iridium spark plugs but haven't yet decided which is best for my 02 reg ML55.
Europarts have Denso plugs but are nor iridium for £6.49 a plug. There are other deals on eblag but seem too good to be true so thought I'd ask on here which is the best plug for ML55?
Thanks in advance.
Chris.

 

[markjay]

Both NGK and Densu are very good plugs. Bosch are also OK.

For a high performance engine I would say NGK.

Iridium is the best, but this relates mainly to service life, not performance. Other plugs - Platinum etc - will perform just as well.