On a 1999 Pontiac Grand Prix GT 3.8L, I am wanting to do a basic tune up when I get it. I would like to put new plugs and wires and do the oil and fluids etc. I was reading the "Safely Modding" thread and it was talking about putting cooler plugs in there. It has a stock engine. I intend to put a short ram intake on it a little later on. Which plugs do I need; Autolite 605 or 606? What is 1 heat range cooler going to do and what could it hurt?
Also I would like to replace the thermostat, as keeping the engine cooler would be more efficient, correct? So which is better; the 160 or 180? I don't want to mess up and end up hurting my performance.
And what is step 8 where you do the Transmission Pan Drop/New GM Transmission Filter? in detail... and is it even necessary?
Thanks!
