Hey anyone know what the best spark plugs to run are? I have the boost set at 18psi and 21psi, so I want a colder plug than stock. Part #'s would help and maybe a good place to get them online. Also 5800 miles and no clutch probs yet.(knock on wood)

 

Dont listen to anyone that tells you a grade 7 is a range colder than the stock evo plugs. There are a few people running heat range 7 thinking they are a range colder than stock...The oem plugs (IGR7A-G) are already grade 7 and are Iridium tipped. Do NOT swap these out for coppers. ie - BP(r)7ES or even 8es. I did and felt noticable decreases in low end power when gapped from the factory recomended gap of .024 to .026. Heck I even gapped them at .028 and they still didnt burn as good as the stockers. The iridiums simply burn better. I know ShapeGSX (hehe) may disagree here, but in my own expierence with my own EVO, thats what I have found. On my GS-T the BPR6ES or even the BPRE7ES would run great, just not on the EVO...

If you do want a colder plug, get the HKS 45g's I believe.. I'd have to refer to my order lol... Its either 40g or 45g... They are heat range 8 though and will mate nicely when running above 21 psi, or even if you track often.

Go to www.hksusa.com to order some. Im still waiting on the next set to come in hehe...as of now they are still out of stock.