recommended spark plugs - Subaru WRX Forum
 
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#1 Old 06-13-2009, 12:13 PM
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recommended spark plugs

i have an 03 wrx with a TBE and soon im gonna get a catless uppipe and spark plugs. my question is which spark plugs? ive heard ppl say to get one step colder than stock but im not sure what the means. thanks
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#2 Old 06-13-2009, 12:40 PM
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#3 Old 06-13-2009, 02:18 PM
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I'd probably steer you away from Pulstar plugs. I bought a set and installed them at 30,000 miles on my 07 WRX which has a tbe and Cobb AP Stage 2 map. Pulstar claims you'll get more hp and better gas mileage using their plugs, but honestly, I didn't notice enough of a difference to justfiy their ourtageously high price. I think I'll probably go with NGK or another similar brand the next time around. Just make sure you pay close attention when you gap them.

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#4 Old 06-15-2009, 12:28 PM
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You should go with the stock range in form of NGK or Denso. If your doing an upgrade that's when I would recommend a step colder plug.
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#5 Old 06-15-2009, 09:51 PM
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I thought I read somewhere that you should go one step colder for every 100 (+/-) horsepower you mod above stock. So, abiding by that theory, a Dodge Viper with 2,000 horsepower should use spark plugs that are 15 steps colder. Hahahaha... but in all seriousness, you're fine sticking with stock range plugs. One step colder plugs are basically mod-list bling for most of us.

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Jorge Carrillo Tuned (365 whp/340 wtq)
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#6 Old 06-15-2009, 11:36 PM
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Stock heat range NGK Iridiums gets my vote.

My name is Ken and I am a HP Junkie.
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#7 Old 06-17-2009, 12:15 PM
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I'm changing my plugs and going to Stage 2 in a few weeks. The shop owner said that the Stock Subaru plugs are just fine. He runs them in his 400+HP STI.
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