Been use copper plug from the day I bought the stang, so I never use platium before, now i take out the copper and put in platium, engine seem more quiet, and not strong like before any more. but the car ran smooth and my gas gauge is not going down fast
. I think I loose couple HP from swith from copper to platium, but i think it worth it, save me gas and I dont have to change it until 50k miles
. Yea im getting lazy work on car now. 




