NGK (6418) BKR6EIX Iridium IX Spark Plug, Pack of 1

Comment: I bought this sparks for my turbo subaru forester.their quality is very good.(Made in Japan)I feel better acseleration on high rpms.And it's seems car consumes less fuel. Let' see how long will they work properly.

Comment: These NGK's are awesome. I self installed them on my '00 Volvo S40 1.9T and instantly got more power! Mine are gapped at .030, just like they came in the box. The price is hard to beat - everywhere else the plugs ran $7-12 each - good thing I looked here! The only downside is the packaging that my plugs were shipped in - a small (but adequate) box, but only a small airbag to protect 4 smaller loose boxes - would have preferred packaging peanuts and the wrong receipt was sent with them.

Comment: The seller was quick and I received the plugs within a week. At the increased expense are the plugs better than less costly ones? I cannot tell. My vehicle runs about the same. I've not noticed any increase in horse power or fuel savings.

Comment: First of all, I'm not sure if you are supposed to gap these or not, when I tried, these scratched the gaper.
Nontheless, when I replaced my old worn out spark plugs with these (there was a huge gap difference, these are much smaller), I got a good 2 extra mpg that I was looking for in my Honda Prelude. (from 18mpg to 20mpg) I haven't noticed too much of a difference in the acceleration though.

Comment: Using these in my 02 WRX with a custom tune at over 300HP with absolutely no problems. These come pre-gapped for the car but you should check them anyway. All of mine were spot on factory specs at .028" but I have seen pre-gapped spark plugs come a little off.

As mentioned, with free shipping, amazon has the best price on these you are going to get anywhere.