I ordered mine from www.sparkplugs.com

I think they were around $50 after shipping.

 

I would be interested to see how the throttle body does on a N/A car.

 

I don't think I have heard of a single account of a TB making any difference on a N/A car.

 

Thanks gernby! I will order them from there when I am ready for them.

I want the Denso IK24 or the Denso IK27? Any reason for Denso over NGK(which I think our stock plugs are).

Thanks for your help with this gernby.

 

If you are going to add them with the S/C, I would try the IK27s first. If they foul out, then get the IK24s. If you start with the IK24s, you won't ever really know if they are too hot, since the ECU will take measures to prevent detonation (retard timing). I didn't really have a reason to pick Denso over NGK. Some S2000s have NGKs from the factory, but some others have Densos. The Honda manual specifies both manufacturers.