Installed mine today.The best price I found was here.Less than $10 ea.
http://autodoctorparts.com/

No real diff so far on the "Butt Dyno",but I can tell the idle is smoother.A lot less misfires.

I'll report back on these in about 2 weeks.

rlr

 

Any "fresh" set of plugs will make the car seem to run better. IK-22s are the stock heat range, so you shouldn't detect any difference in performance. What you should see is that these things will last a very long time.