not a fan of any iridium plugs, they break up with the slightest hint of detonation. If you're running without a cat, use NGK BCPR6ES, if you have a cat, use PFR6E-10
I run Denso IK22 in mine and I´m very satisfied with them. Before without the cams I had the hotter IK20 that are pretty similar to the NGK BKR6EIX.
Other alternative for you NGK PFR6G-9 (double platinum type)