He recommends the PFR6B-11B for your application, and frankly you don't need a heat range any colder than that unless you are using more power adders like nitrous, etc. So again, he recommends the stock plugs for up to 15 psi. Use those. You have absolutely no reason to go a heat range colder.
Recursively Yours, Kenny... PETZ Member #5
SteamyZ. Never had did me wrong. - SL103 07/06/04 11:58:15