I have a 2007 Civic LX. I wanted to change my plugs as I have 106,000 miles on it and am noticing less power and gas mileage. I picked up a set of AutoLite Iridium plugs from the local parts store. Since purchasing, I've read that I should NOT use the AutoLite and should use the NGK OEMs. On one thread, I read someone was quoted at $21 per plug at the dealer, and others saying you can pick them up much cheaper.
What is the NGK part I need to purchase? I called my Honda dealer and he didn't know...just that they were NGK and cost $81 for the set of 4.
Can I find the proper NGK plug at a NAPA store for cheaper? Also, do the Ignition Coils need replaced at the same time as the plugs? If so, what type and where should I purchase them?