as the title says... can anyone advise me where i can purchase a set of HKS iridium plugs one heat range colder for an EVO 9? I found sites in the UK, but they dont sell to US residents. Plug choice for the 9 is limited... the Denso option IKH24 that everyone recommends is actually a few mm longer than the stocker which concerns me (according to sparkplug.com specs) Apparently the correct size is 14mm thread, 3/4" depth(19mm or so), 5/8 hex. The ikh24 shows a 26.5mm depth?
And i do not want to go w/ the autolite, splitfire plugs that show as the only option for evo 9... and i can't locate a colder factory ngk plug..
I heard HKS makes a part specific plug w/ colder heat ranges and cheaper than the NGKs... so if you know.. pls advise.. THANKS!

-Tom

 

im running the ikh24 with no issues, they work great...

if you do a search for ix spark plugs, you will see a list of ngk plugs and different heat ranges, but they are expensive, i think 25 a plug or close to that. the denso's work just fine

 

damn... i wish i was patient. thx for the reply though. i went ahead and bought the HKS iridiums. 75bucks for all 4... hella expensive. Suckers better be worth it...

 

patience would have been good, i replied 3 minutes after you posted lol.... its ok, im sure you will be fine with the HKS, just a waste of money IMO

 

HKS s40il iridiums are running great! really smoothened it out. I guess any colder plug would do that.. but its the only set that i could find that were evo9 specific, besides the NGKs which were around 140! the 80 bucks i spent wasnt too bad.
if u dont mind spending the cash... they are great plugs!

 

do the new plugs effect your tune at all?

 

maybe if you had an aggressive tune and were getting knock it should lower the knock count other than that no.

 

agree w the above... the colder HKS plugs help w preignition if u are running an agressive tune. meaning its not ur a/f or timing that is causing the knock. im knock free anyways, but it does run noticeably smoother. especially when I crank it up to 24psi...on occassion

 

Where did you get these from?

Any online links?

Thanks

 

i ordered them from EDOperformance.com
I never heard of them until i did my search for these spark plugs. They had them and i got them shipped in 2 weeks. (not bad considering they get them from HKS first) The part no is s40il (HKS Super Fire Iridium) they are part specific for the EVO 9 and 1 heat range colder. I forgot exactly what i paid for them w/ shipping...but it was no more than 80bucks for all 4. Expensive... but the NGK iridiums (1 colder) are over 100bucks.