Mazdaspeed2oo35
600whp - 600wtq at 30 PSI
The 7 series are 2 steps colder than stock, but yes 6 series would work too.
That's the ones i bought from USA last time, 2 steps colder NGK Laser cut Iridium plugs, since i don't have them here with me i can't tell you the model of them, but yes i bought them 2 steps colder and i paid like $ 10 a piece, so they better and must be good and last lol lol
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