I can check the PN next time I'm down at the shop.The 8 heat range worked for that combo on pump gas.I suggest you determine which PN you need and get 3 sets with 3 heat ranges say like 7,8 & 9.Plug reading must be done by clicking off the ignition at WOT at least at the top of 2nd gear AT or 3rd ith manual.
Making a pass at the track click off over the stripe at WOT.If you drive back to your pit it will nullify the plug reading.You would like the change in color on the strap to be at the elbow.