After searching and getting mixed results I decided to find the info and post it. Subaru wanted almost $70 for the stock plugs and for the IX iridium One step colder plugs. The prices I posted are from NGK.com and you can buy them online. NAPA also stocks NGK but you will need to give them the stock# and they are around $2 more per plug.

Part # Stock #
ILFR6B 6481 OEM Plug Iridium $11.71
LFR6AIX-11 6619 IX iridium stock heat range $7.60
LFR7AIX 2309 IX iridium One step colder $7.60

LFR6A-11 3672 V-Power stock heat range $5.08

PLFR6A-11 7654 Double Platinum Recommended by Phil (Element Tuning) $11.71

+1 for nice post
-45 for wrong forum

I think this is the first time I've had a post moved. I never go to the service or maintenance forum and forgot we had one. :lol:

Your forgiven as the post is a great one.

Yeah.....reminds me to update my damn Spark Plug FAQ with this info one of these days. :)