Ok. I am going to have a 90 shot single fogger installed on my GS400 in the next week or so when the parts come in from NOS. However from my friends who run NOS and the shop installing it say to buy 2 steps cooler of a plug so they wont burn-up. Does anyone know what model denso is 2 steps cooler? NGK? If so how does the car run off the juice at low rpm with cooler plugs?

Thanks

 

If you have Iridiums, chances are you may not need colder plugs.