Just the regular NGK Platinum plugs, not the double platinum or iridium plugs. I installed them in my old truck 2007 dodge ram Hemi, they worked awesome, the engine ran so smooth, I wondered myself why did Dodge used the crappy champions copper plugs from factory, you'll notice too when the engine is first run in the morning, there is a slight shake to the engine. With the NGK plugs, the slight shake is eliminated, it will run so much smoother than it was new. Trust me.
Last edited by bluedodgeram; 09-27-2012 at 08:37 PM.