I didn't want to shit on the last guys plug part, so I just started a new topic.

What do you guys suggest, as I did replace my plugs with stock ones, before I did any mods.

Do you think different plugs are called for?

Current mods -

180 Tstat
Front Plog
3" "Off Road Cat" Downpipe (ZZP)
3" Catback (ZZP)
Home made CAI

And sooner or later - a tune, and maybe a pulley drop. But above is what I have for now.

Thanks for the help/suggestions guys.

-- Sun Mar 07, 2010 4:01 pm --

Thanks for no suggestions. Jerks.

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From Jamhoney who runs 11.2 with his Comp G (M90 not turbo)

2.9 or smaller = 3 ranges colder(.04-.045)
3.0-3.2 = 2 or 3 ranges colder(.045-.05)
3.3-3.5 = 2 range colder(.050-.055)
3.6+ = Stock or 1-2 ranges colder(.055+)

Since you still have a 3.8, I'd say stock plugs unless you are planning to drop pulley size really soon.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

I think you'd be ok to run Autolite 605's if you wanted to. Most stock GP's have some KR, so it won't hurt.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

Autolite 104's... 605's are for non-s/c

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1.8 Rockers, and PRJ Cam Next UP !!

He's on the stock pulley, he could run 104's, but 605's are fine for stock pullied cars. It's not like you can't run 605's on an s/c car, but I know what you're saying. It's not a bad idea by any means.

If you plan on dropping below stock I would also recommend 104's. I've ran them for 2 years (not the same set, obviously) and they perform like spark plugs should, lol.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

i just picked up some NGK iridium tr55ix plugs from the local parts store. are they hotter/colder than normal? good or bad? looking for your opinions. car is stock 05 gtp.

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2005 Grand Prix GTP Comp G

^ I'm pretty sure that's what I have in the car right now.. Don't know anything about them tho.

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