Quote:
Originally Posted by doggboy
The NGK 95770 are 1 step colder but can be used with out a tune.
The NGK 97506 are 2 steps colder and should not be used without a tune.
The quick and dirty rule I have heard is one step colder per 100hp.
|
OK, I looked up the 95770 and most/all sites only show it as a fit with the 3.0 I6 models, and only show 97506 for the 4.4 V8. NGK's site doesn't show the 95770 at all - does that mean it's been discontinued? A number of sites are out of stock or higher priced for 95770. Do folks regularly swap to 97506 on stock tune without issues?