Eric94GT

My car is in need of a Tune-up, I ordered the Ford Racing 9mm wires,Msd Cap&Rotor,K&N Drop in filter,and a new fuel filter. I didn't know what plugs to go with, I know some cars like work better with one brand over another.

94 GT 5.0

MACDRIVE

NGK

AdderMk2

Autolite copper, get the 25's

MACDRIVE

NGK UR45IX Irridiums

P Zero

Just use the OE (original equipment) plugs. Youre not going to gain ANY hp or performance by buying a fancier or more expensive plug. Unless youre running nitrous, raised compression or forced induction, the BEST plug is the stock motorcraft.
-P.

samseed101

Irridium plugs in a Mustang? I'll pass on that one. I see no reason to choes them over Autolite 25s (or a step colder for boost or nitrous.) And I have seen othing but problems for anyone who I knew that ran Iridium or Platinum plugs in their Mustangs.

dman302

I run the autolite 3924's as the recommended sub for champion (Eddy heads rec a champion number) most guys I know run the 3924 as well, cheap and as effective as any. Lately I've been running the AR3924 which is a modified autolight race plug, found them to be worth a touch of HP on my last dyno session...and I'll take any little bit I can get.

ROTTITANK

Ive beening running autolites 24s.Im happy with them.

88BlueGT

Autolite 25's here

gspfunk

x3 on the autolite 25's. I've been told that Autolite makes the Motorcraft plugs. I don't know how true that is, but I know Autolite's won't let you down.