foxtrot

I need to tune my 98 GT and want the best plugs. Which ones do you recomend for the 4.6 2V?

SilverGTV8

If you don't mind changing plugs every year a nice set of Motorcraft Coppers are good. NGK Iriduims are nice. I just installed Denso Iridiums, pricy though, but had good luck with them in other cars and so have my friends.

code3GT

NGK TR55

kubball2005

I just installed the same plugs on my car last week, my car had the ORIGINAL motorcraft plugs in still after 90k miles. I felt a really nice change in how my engine ran and got through the powerband.

jkm1987

NGK coppers is what i have they are nice

LIVIN_LEGEND

NGK Iridium TR55IX Spark Plugs
http://www.lmperformance.com/4800/50.html

Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200(=F) higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. Prior till now, platinum had been favored for long life or performance spark plugs due to its high melting point, also the technology did not exist to machine and bond iridium on a spark plug electrode(at least in a cost effective manner). Iridium industrial spark plugs have been around for years, but still sells for over a hundred dollars per plug. Just now is the technology available to effectively use iridium in a spark plug for automotive applications. The strength, hardness and high melting point of iridium allows NGK to manufacture there iridium ultra-fine wire center electrode to 0.7mm. One of the finest firing points in the industry! (Thus far there has been no problems reported regarding use of iridium plugs with nitrous oxide.)