denso iridium plugs

[lk2drvmach1]

Has anyone tried these in their mach? I've heard that they will increase power and improve mpg, but haven't seen any before/after dynos. Most of the tests that I have seen were on blown motors, where they did make an improvement, but mostly because standard plugs wouldn't fire at the higher pressures. The denso's were able to keep firing under the increased pressures, which improved the power. I'm just wondering if they will make much difference in our non-blown engines.

Denso iridium plugs (http://www.denso.co.jp/PLUG/iridium-e/index.html)

Rob

[BagheeraBullitt]

Well what I have heard is that no, they don't make but about 1 rwhp in a N/A engine, but I'm just going off of what I have heard on imboc.com.

[Tomcat427]

I was really close to installing these in my Mach 1. I want to go with a colder plug and I was not sure of how cold I should go and that is a lot of money for plugs to experiment with. I am going with NGK TR6's to start with, set for under $20. Once I have evidence that a colder plug will help my engine I may still put them in.