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To honest mate your probably best sticking to platinums as most go iridium or copper but always go back platinum NGK cater for all states of tune, hope this helps.
I'm using NGK iridiums in my 03 STi running well above standard, at the mo. and have had no problems at all. They've been in for over 15k but I'll probably change them soon.
The Denso's you want are IK22
JohnD