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ok so ive done a little digging and found these two part numbers,

Denso Iridium IHK22

NKG LFR6AIX-11

but i also found HKS plugs (M35IL)

and NKG recomend LFR6AP-09

so i have two questions, which plug is best for the M35 ( highflowed if it matters)

and best place to get them, as 180 for plugs sounds steep.

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The NGK suggestion is the same as what I use, other than the gap. As our coils are strong the 1.1mm gap is fine on the LFR6AIX-11's.

I buy mine from the US, and I buy at least 2 sets at a time to make the shipping cheaper. Perhaps you can go halves with someone local?

http://www.ebay.com.au/itm/160704553314?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I found the IKH22's fail too quickly, the iridium tip had completely melted away within 20,000ks, the NGK's seem to handle the heat much better.

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  • 6 months later...

sorry to dig up old thread, just some more info to add

source : http://www.globaldenso.com/cgi-bin/global/plug/jpn/4w/4w-plug.cgi?name=STAGEA&filename=maker7car.csv&action=search

MODEL CC VEHICLE CODE ENGINE FROM TILL DENSO GENUINE P/N IRIDIUM POWER IRIDIUM TOUGH IRIDIUM RACING QTY STAGEA 2000 WHC34 RB20E 96.10 97.8 Q16PR-U11 - IQ16 VQ16 IQ01-sqr.jpg 6 STAGEA 2000 WHC34 RB20DE(LEANBURN) 97.8 01.9 VK16 - IK16 VK16 IK01-sqr.jpg 6 STAGEA 2500 WGC34·WGNC34 RB25DET(T/C) 96.10 98.8 VK16 - IK16 VK16 IK01-sqr.jpg 6 STAGEA 2500 WGC34·WGNC34 RB25DET(T/C) 98.8 01.10 VK20 - IK20 VK20 IK01-sqr.jpg 6 STAGEA 2500 WGC34·WGNC34 RB25DE 96.10 01.9 VK16 - IK16 VK16 IK01-sqr.jpg 6 STAGEA 2500 NM35·M35 VQ25DD(NEO-Di) 01.10 IKH16 - IKH16 VKH16 IKH01-sqr.jpg 6 STAGEA 2500 NM35 VQ25DET(T/C) 01.10 04.8 IKH22 - IKH22 VKH22 IKH01-sqr.jpg 6 STAGEA 2600 WGNC34(260RS) RB26DETT(T/C) 97.11 01.9 VQ20 - IQ20 VQ20 IQ02-sqr.jpg 6 STAGEA 3000 HM35·M35 VQ30DD(NEO-Di) 01.10 04.8 IKH16 - IKH16 VKH16 IKH01-sqr.jpg 6 STAGEA 3500 PM35·PNM35 VQ35DE 04.8 VKH16 - IKH16 VKH16 IKH01-sqr.jpg 6

Nismo plugs

source : http://www.nismo.co.jp/en/products/competition/engine/pdf/engine02.pdf

part no: 22401-RS345-8

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I am using NGK LFR7AIX plugs, they are lasting well but I would like to take some more heat out of the combustion chamber.

I tried to find LFR8's but they don't make them, you jump up to expensive racing plugs from there. ($300 a set) Looks like I am stuck with the 7's for now.

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