Just curious if anyone knows a part # for some NGKs that are one step colder than the #4177 TR6s.
<img src="http://registry.gmenthusiast.com/images/sinistercav/turbo24sol.gif">
NGK Iridium IX
TR7IX
3690
thats what it says on the box. 2 steps colder
Im a Xbox 360 fanboy...and damn proud of it!!
2 steps colder then stock, but yes those are one step colder then TR6's
I'v got a set of NGK BKR9EIX 2669...... the price was right
Heat range of 9..... 4 steps colder then stock......thread depth is about the same (same reach in the head) I'm going to throw a set in our drag car, and see how it runs.
NGK Code
SPD RCR Z -
'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
