There are a couple different heat range plugs available for the rotary engine. I have only tried the one, that was Denso recommended.

I've been looking for some extra power from my GTUs. $70 dollars for plugs is cheap. Thanks for the tip.

Icemark: These Denso plugs, are they the same plugs that the RX-8 is running?

I don't know for sure, but I suspect they are, just based on price.

The IRE01-31 is about 2 steps colder, and is what is suggested for the trailing plugs, both in the FC and FD

I just downloaded the Owners Manual for the RX-8. It's listing an NGK RE9B-T and a RE6A-L (or RE7A-L) in the specifications page. It also says they are Iridium plugs.

I'm still trying to find a vendor out there that sells the NGK RX-8 plug.

Icemark: so if I replace my sparks with these Densos (part numbers for trailing and leading would be cool ;)) I should have around a 5hp gain at least? my sparks are probably falling apart so it would most likely be higher.
Also, which do you suggest, iridium, platinum? what and why? :) thanks

I sent a couple of emails out to a couple different NGK vendors, let me see what they can do.

Cool. I doubt the NGK plugs are any cheaper (price wise) than the Denso ones, but I would like to compare the NGKs and the Densos designs. Let me know if you find anything.

On a side note, what CDI setup are you running on your vert that you're burning plugs so fast?

http://www.denso.co.jp/PLUG/iridiumracing/index.html

INFO on the iridium plugs

can the denso plugs be gapped or are they like the stock ngk's where you just throw them in there, wait for them to wear out and loose gap, and then replace them?