Has anyone had any experience with the Bosch platinum 4 plugs. My Z is stock right now. But planning to do the Free Ram Air and a plug and wire change this weekend. This may have been posted before, But I haven’t been able to find anything about them. Thanks.

 

I used Bosch Platinum +4's in my 94Z and they were great. Since then I've swapped to NGK TR 55 spark plugs. It seems the NGK's are hard to beat. Overall the +4's are a fine plug though,

 

They only problem with bosch plugs is their electrode size it is way to small they would be alot better if they used a bigger electrode