Dodge

I am looking for a plug that will work great with the hemi. i am also looking for added perforblokece and improved gas mileage. i have already added cold air,bigger exhaust.also will be adding a chip soon.

Mate, ignor the last "ford" pecker head. ok, bosch and ngk are both good brands of spark plugs, but remember the most important aspects of a spark plug are, 1, the gap, which ensures the strong spark "jump time" to ignite the fuel and 2, heat range of the spark plug itself. obviously u have changed this with cold air intake, larger exhaust and soon a performance chip. the best advice to get the optimum performance out of u engine with these mods is to have it dyno tuned, by qualified tradesmen, with the right equipment. they will also advise what spark plugs to use after trying several brands/types. you have spent alot of money so far, but unless u do this last step, its all a waist of time and money for u. they will tune u engine to the chip, exhaust and cold air intake for maximum performance and economy . . good luck . . cheers