R RichB Member : 2007 Cosmic Blue Mazdaspeed 3 GT Nov 16, 2008 #1 Does anyone recommend using the Denso Iridium ITV20 Spark plugs with stock heat range? Or should I just go with the step colder ITV22's? Last edited: Jan 9, 2009
Does anyone recommend using the Denso Iridium ITV20 Spark plugs with stock heat range? Or should I just go with the step colder ITV22's?
L LBV Member Nov 16, 2008 #2 No need to really go with the step colder unless you're doing something to increase your cylinder temps like upping the boost.
No need to really go with the step colder unless you're doing something to increase your cylinder temps like upping the boost.
