oh yeah my bad TR5 are stock the TR6 is what i have. one step colder is what they should be. really, it all depends on what type of nitrous system you have, and ignition setup. if you have a stock ignition and timing curve, or are using more than a 75 shot, run the colder plugs. i'm running a 100 shot on 1 step colder plugs. i'm going to step it up to a 2 stage setup that will total 125 and i'm going to stay with the same plugs, but retard my timing another degree or two. thats why i have a MSD
