Use a heat range 8 or so NGK plug. Stock is a PFR6A-11. You can get BCPR7Eix which are a 7 plug pretty easy most places. You can get the NGK iridium 8's from Apex, and Greddy.NikWilson said:I am running about the same and using HKS S45's iridiums (which is grade NGK/Greddy grade 9). The car has been mapped using these plugs as well. Only a slight issue of cold starting but really great when warmed up. Using the pre set gap since you should never try to re-gap an iridium plug.