Spark plug Denso or OEM Subaru

I switched to the Ikh24 and it really smoothed the car out.

Replaced my OEMs this summer to Denso K16GPR-U11 and has been getting really good mileage and smooth idling since then. Now planning to try NGKs next time.

Denso Iridium plugs work perfect in 2.0T Got them from Autozone for $8 each, smooth idle at start up and when warm, great response, made in USA.

I've been running these Denso's for almost a year now, seems to be a good plug for the price! :thumbup:

I've personally ran these plugs in my car with 40+ psi of boost and lots of ethanol for the past 5 years. Great plugs!

Ik22 is one heat range colder than stock,and I have installed these in many 1.8T & FSI cars from stock/mild tune/heavy modded and worked great.

Denso iridium are great for turbo cars

NGK are also good, but in experience denso iridium works better when running more than 1 bar of presseure

I dunno about coil packs but I put in Denso Iridium plugs a couple months ago and they have been working out just fine...

When it is warm out the IK24's work awsome. But on cold mornings they suck for the first 3-5 minutes of driving.

All the recommended denso plugs have the wrong gap. They list 1.1mm gap for the 2.0t The recommended gap should be .7 to .8 mm Plus the "20" heat range misfired a lot in the cold for me (about 20 deg F)