Spark plugs, NGK are a good choice for a daily driver because you dont need to change it as often as autolite copper core 103 -104. The NGK TR55 are one heat range colder good for 3.4 pulley plus cold air induction and a colder T-stat 180. Any thing more then those look at getting NGK TR6, the TR55 setup plus a 3.25” supercharger pulley, 1.80:1 or 1.90:1 rocker arms or very mild cam, exhaust headers, cat-back exhaust system, and reprogrammed PCM. Gap at .55 - .57