Which spark plugs to use?

[Grim0013]

Hi, I am working on getting the beast ready for the new year, but am not sure what plugs I should be getting, given my level of mods. Much of the engine work was done before I bought the car, so I didn't learn this stuff when it was being done, if that makes sense...

Anyway, the car hit 496 HP and 507 lb/ft on the dyno a few years ago. The only thing I have changed since then is replacing the old Extender Extreme chip with a Turbo Tweak alky chip.

Not sure what all is relevant, so here's the rest of the mods (that I can remember) on the car:
3.5" MAF
PTE (I think) 63mm Turbo (I think)
Not sure what the intercooler is - looks like some sort of stock (has Garret badge), maybe stretched? and has 2.5" inlet and outlet...seems kinda small, been thinking about a front mount.
75-ish mm Throttle body
RJC power plate
forged pistons, Ross, I think
Champion ported irons
"mild" cam - no idea on the specs, assume it's just a notch more aggressive than stock
3" DP and cat back
Alkycontrol single nozzle alcohol kit
Translator plus
Turbo Tweak alky chip


So, I'm trying to determine which plugs I should be using, and any other advice on what I should be taking care of to tune things up, other than an oil change w/ some ZDDP.


Thanks in advance,
Brad

 

[williamsGN]

A search of this forum will return many results on the subject.

 

[The Darkside]

I use NGK UR-5's, but heard that Autolite 23's & AC R-43TS plugs are excellent also....