If you happen to have an EJ207 engine out of a JDM STi, and you've attempted to replace the spark plugs, you've noticed that the original plug is an NGK PFR7G platinum plug.
Well, if you've tried to get that exact same spark plug, you've undoubtedly come up short. If you go to your nearest friendly Subaru dealer with the OEM part number, 22401AA600, they... well... they're supposed to remain friendly and not tell you to sit on it, but they won't be able to order that part number for you.
Don't bother calling Advance Auto Parts, Autozone, Carquest, O'Reilly, or any of those places either. They'll be able to take that number and supercede it to an NGK BKR7EIX or a Denso IK22, which are both iridium plugs, but if you're picky to a fault (like me) and you don't want to use iridium plugs and would rather stick with the plug that came in the engine, this simply won't do.
Either that, or they will screw up and try to sell you the factory Honda S2000 spark plugs, which are PFR7G-11 and gapped too wide for a forced-induction engine.
You can even take NGK's stock number for these plugs, which is 4364, and search for it on NGK USA's PDF catalogue and you'll still come up short.
But wait... there's hope!
If you instead go to your nearest friendly Lotus dealer, and either ask for a set of spark plugs for an Exige (or simply give them the part number A128E6006F), you'll walk out with these!
Since the Exige uses the Toyota 2ZZ engine, and it's also supercharged, it needs the 0.8mm-gapped PFR7G...
... and to the extent that I've researched, it's the only car to ever be sold in America that uses that plug from the factory.
Oh, and I'm also going to replace the PFR6Gs (which is what the EJ205 WRX uses) currently in the B4 with these, hoping the colder heat range will help alleviate the pinging I'm unfortunately still hearing occasionally under boost.
The catch? Yeah, there's a catch...
... Lotus knows that they're the only people in America who can get that plug, and if you don't want to pay them the $35.27 they want per plug, they too are going to tell you to sit on it
