Denso U-Groove Traditional Spark Plug Stock Heat Range 3381 ( Part Number:DEN K20HR-U11)

Denso U-Groove Traditional Spark Plug Stock Heat Range 3381

Manufacturer Part # K20HR-U11


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This innovative Denso spark plug comes equipped with Denso’s patented U-shaped ground electrode.  The U-Groove forms a channel for the spark nucleus to form at the instant of ignition, which generates a more potent spark.

More importantly during regular service intervals it is wise to check your spark plugs for wear, because new spark plugs will ensure for a healthy running engine, increased fuel economy, and better response. These are the factory heat range spark plugs for your vehicle, and should be a direct fitment.

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Brand: Denso
Heat Range: 20
Plug Gap: .032
Stock Number: 3381
Mfgr. Warranty: 1 year or 12,000 miles
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.


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Verified Purchase

Great Plugs
Brocks003k17867 3 years ago
The plugs are great. Make sure you check the gap though. 3 were gapped at .043 the third was .054.
Verified Purchase

Great but. . . .
ScoobyDubi 3 years ago
I just installed these on my 05 Subi FXT. First off, they come pre-gapped but I double checked them anyway. Not sure if it was just mine but they came pre-gapped for the non-turbo 2.5L forester. No problem so I just re-gapped them and installed. Secondly, while trying to install my coils it was pretty tough to get the boots around these plugs. It felt almost as if I was jamming them in there. I took it apart a few times just to make sure I was doing it right. Only one of my coils slipped right over the plug. Anyway, took them for a quick little spin and the FXT runs great. I would definitely recommend as a stock replacement just make sure you have the gaps correctly sized.
Verified Purchase

Namelessghoul 3 years ago
Installed on '10 STI, runs great!
Verified Purchase

Can't complain
MSPSTI 3 years ago
Checked the gap on all plugs and they were dead-on right out of the box. I would advise everyone to be careful when removing the ignition coil connectors. I broke one of the plastic clips and had to install a zip tie to keep everything tight.
Verified Purchase

Fast shipment.
Fazgt 3 years ago
Items as described by RSD. Great quality

  • Q: pricing  dukes 1 year ago


    is this a price for just one...and these are replacement for 2012 wrx right?

    • A: This will fit the 2012 WRX, and this is the price for a single.

      Nick S. 1 year ago
  • Q: fit  Dmansuba 3 years ago


    will these spark plugs fit a 1998 impreza outback?

    • A: These are only confirmed to fit The Subaru Turbo Model applications.

      Kyle A. 3 years ago
Subaru Impreza
WRX STI 2004, 2005, 2006, 2007WRX STI Limited 2007WRX STI Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX STI Special Edition Hatchback 2010WRX STI Limited Sedan 2011, 2012, 2013, 2014WRX STI Limited Hatchback 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX TR 2006, 2007WRX Limited 2006, 2007WRX 2006, 2007WRX Sedan 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Premium Sedan 2010, 2011, 2012, 2013, 2014WRX Premium Hatchback 2010, 2011, 2012, 2013, 2014WRX Limited Sedan 2010, 2011, 2012, 2013, 2014WRX Limited Hatchback 2010, 2011, 2012, 2013, 20142.5 GT Sedan 2009, 20102.5 GT Hatchback 2009, 2010
Subaru Legacy
GT Limited 2005, 2007, 2008, 2009GT 2005, 2006GT spec.B 2006, 2007, 2008, 2009
Subaru Forester
XT 2004, 2005XT Premium 2005XT Limited 2006, 2007, 2008Sports 2.5 XT 2008
Subaru WRX STI
Base 2015, 2016, 2017Limited 2015, 2016, 2017Launch Edition 2015Series.HyperBlue 2016