99french

iTrader: (7)

So my question is do I stick with the tr5/55 or do I step down a heat range or two. Mods are in my signature and car makes 420 at the tire maybe a little more.
I was on ngk website and went by their formula and it was suggested for my hp and compression to step down.

speedtigger

iTrader: (16)

I have a similar SCR and DCR and maybe make a bit more power. I have run both TR5s and TR6s. The TR6s stay pretty clean. The Tr5s stay a bit cleaner, but you can see the heat in the strap is a little high. However, I have never had any detonation problems with the TR5s.

I will run either, but if I had to choose only one, I would probably take the Tr6s.

HCI2000SS

iTrader: (2)

I run the TR6's with my HCI build, and am very happy with them

99french

iTrader: (7)

I'm going to try them and see if there is any difference at the track and see how they hold up with my 2step but I'm not expecting any bettor than my tr5. Maybe next year ill get to do back to back dyno sessions or track passes