Last month I went to get New Plugs for my 2010 GTS. I got the Denso Iridum Power Now my car is not running like it was be for. Its not that its running bad just different? I Think I'm not getting all the power of my car! And my exhaust is a lot quieter! Any idea why? Help Me.


KNN.
Tsudo Cat-Back Exhaust.

 

What Denso spark plugs you get?

IK16 is the proper model for 4B12.

 

yes thay are IK16

 

Then everything should be fine.

 

Ok Thanks for the help.