I've got them in my beast. Not sure how they compare to anything other than stock to be honest. And I'm really not sensitive enough to the change I suppose because all I can say is that they're working. I've not been into racing (can't afford it yet) but wanted the best components I can afford for my car.
If i recall correctly, they're the same thing. In fact, if you look on the NGK plugs, you'll see "Denso" written on them..damn thing is, the NGK's are more expensive.
But, don't take my word for it, I may have the company names confused, but TKarr bought iridium's (I'm pretty sure from NGK), and "Denso" was on the plug itself.
'94 R/T TT
'95 VR-4 Spyder
'95 Pearl Yellow R/T (belongs to Mom)
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