GB:NGK Iridium Racing Plugs and Power Cable Racing Plug Wires
Rotary Enthusiast
Joined: Jun 2003
Posts: 874
Likes: 0
From: Ottawa, Canada
I've been trying to get these for a long time, but nobody knew about them. This price is also a steal. The 6725 are around 200$ a set.
It's simply because they are not designed to be run frequently in low RPM or idling situations. And you will experience rough idle or even knocking since these plugs were designed to run with racing fuels that have much higher knocking resistance than regular pump gas. So if your car is tuned for high psi singles that runs on racing fuels all the time, then you can still use these plugs whether or not you run on the street. 
The judgment is really yours because it depends on how you set-up and run your car. I cannot say that your car is definitely not recommended to run these plugs just because you are only running twins on the street. One thing you can use to base your decision on is that these plugs were designed and tested in professional racing/track applications so these plugs are definitely a necessity for those who track their cars. Personally, I believe that these 9's should be a good choice for those of you who are running fully modded twins tuned for high octane number fuels even if it's just for street application.
nik is absolutely right about the couple facts he mentioned. These plugs are top of the line performance plugs you can get for the 7. The R7420 is much longer lasting and requires a lower voltage than the R6725 platinum plugs so it has a higher consistency and stability in ignition performance.
My coordinator in Japan will be updating me on the supplier prices for the power cable in couple days. I will update once I find a better deal on them.
nik is absolutely right about the couple facts he mentioned. These plugs are top of the line performance plugs you can get for the 7. The R7420 is much longer lasting and requires a lower voltage than the R6725 platinum plugs so it has a higher consistency and stability in ignition performance.
My coordinator in Japan will be updating me on the supplier prices for the power cable in couple days. I will update once I find a better deal on them.
Good news for people getting Power Cables, just got back from talking to my coordinator in Japan, we found another supplier who can give us a much bigger discount on the price and domestic shipping in Japan. We are still working on the FC wire price to see if we could get it down more. The FD wire price is a steal so get them while you can because we are hardly making any money with this price. 
We have to change the min. order requirement for the plugs to 10 sets also to accommodate the change in price for the wires.
The new GB prices come down to: (min. 10+ orders to get these prices)
03Z (FC3S): $90 + US domestic shipping
04Z (FD3S): $81 + US domestic shipping
R7420 Iridium Racing Plugs: (min. 10+ orders)
1. nik (2) 11's
2. Tim Benton - 9's
3.
4.
5.
6.
Power Cable Plug Wires: (min. 10+ orders)
1. ApexFD - fd wires
2. Tim Benton - Fd wires
3.
We have to change the min. order requirement for the plugs to 10 sets also to accommodate the change in price for the wires.
The new GB prices come down to: (min. 10+ orders to get these prices)
03Z (FC3S): $90 + US domestic shipping
04Z (FD3S): $81 + US domestic shipping
R7420 Iridium Racing Plugs: (min. 10+ orders)
1. nik (2) 11's
2. Tim Benton - 9's
3.
4.
5.
6.
Power Cable Plug Wires: (min. 10+ orders)
1. ApexFD - fd wires
2. Tim Benton - Fd wires
3.
R7420 Iridium Racing Plugs: (min. 10+ orders)
1. nik (2) 11's
2. Tim Benton - 9's
3. gotboost920 - 11's
4.
5.
6.
Power Cable Plug Wires: (min. 10+ orders)
1. ApexFD - fd wires
2. Tim Benton - Fd wires
3.
1. nik (2) 11's
2. Tim Benton - 9's
3. gotboost920 - 11's
4.
5.
6.
Power Cable Plug Wires: (min. 10+ orders)
1. ApexFD - fd wires
2. Tim Benton - Fd wires
3.