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Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381 (Part Number: )
Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381 (Part Number: )
Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381 (Part Number: )
Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381 (Part Number: )
Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381 (Part Number: )
Denso U-Groove Traditional Spark Plugs Stock Heat Range 3381
Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
Read 6 Reviews | 10 Q&As
Part # K20HR-U11-GRP
$22.32


Ships in 24 hrs

Features & Product Details

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. 

Sold in a set of 4.

Specifications

Brand: Denso
Heat Range: 20
Plug Gap: .032
Stock Number: 3381
Mfgr. Warranty: 1 year or 12,000 miles
Condition: New Product
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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REVIEWS & CUSTOMER MEDIA

6 Reviews
5 out of 5 Stars
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These are easy to do, don't listen to people lol 7 months ago
SalLV
I would always hear people harp on about how hard it's to do spark plugs on F4 engines when in reality it's incredibly easy. If you're already modified with a CAI or short ram it will then be even easier. Also copper core plugs will perform better than your iridium/platinum if you weren't already aware. Copper=performance iridium/platnium=longevity And keep in stock heat range if all you have is an exhaust and intake lol you only need to go steps colder if you're pushing about 100whp over stock.
  
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Better then NGK 9 months ago
Eddie
Changed my plugs after 20k and noticed right after installing the amazing difference, I've ran with the stock NGK Subaru spark plugs before and these spark plugs are far better. Throttle just feels all around better
  
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0 of 1 people found the following review helpful
Denso OEM Spec Spark Plugs for 08 OBXT 1 year ago
ShiiftyBiscuits
Got these plugs for some routine maintenance. Installation is a little time consuming but not hard with the right tools. They seem to work great, but it should be said that they MUST be gapped prior to installation. One of the plugs came with a gap of 0.06!!
  
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Simple and Great 4 years ago
jake.ober201240264
Just installed these one my modified WRX these look great and perform well, gas mileage on my wrx is up to about 28 on highway at 75mph
  
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Very good Product 4 years ago
jake.ober201240264
These are perfect for a slightly tuned car. My WRX has a couple STI Mods and I put these in and completely smoothed out my idle. The spark points are very big and solid, easy to put in, can't wait to put them to a hard test in the canyons.
  
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QUESTIONS & ANSWERS

  • Q: Stock Plugs  bogart3 years ago

    Are these plugs the same as the stock STI plugs (2012 model) Thanks
  • Q: Stock Plugs  13TWRX4 years ago

    Are these the same plugs found on a stock 2013 WRX? Or would it be best to just purchase the official Subaru OEM plugs?
    • 0 of 0 people found the following answer helpful

      A:  I am not sure the exact plug used in the stock 2013 WRX but these are designed to be an OEM stock heat range replacement. Thank you.

      Sterling W. @ RallySport Direct 4 years ago  
        
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  • Q: Best bet for Stage 1?  ShaBorse4 years ago

    I'm assuming since I'm not 100hp over stock, would these would be my best bet? I only have the Cobb SF Short Ram, V3 accessport, and an SPT Exhaust.
    • 0 of 0 people found the following answer helpful

      A:  Yes, I would recommend these for your application.

      guest57853c642a8d25b5018c44a7 @
        
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  • Q: Gapping  tommyshibby4 years ago

    What is the gapping on these spark plugs??
    • 0 of 0 people found the following answer helpful

      A:  These spark plugs are set to .032 from Denso and it is always a good idea to double check the gap before installation.

      Zach G. @ RallySport Direct 4 years ago  
        
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  • Q: how much HP?  bmxhotsauce419405 years ago

    how much HP will these hold up to? 100+ over stock HP or more? but will have to be changed out more often?
    • 0 of 0 people found the following answer helpful

      A:  There is not a limit to the power these spark plugs will support, but it is recommended to go one step colder for every 100hp over stock. Copper plugs do not last as long as Iridium and will need to be changed more often.

      Zach G. @ RallySport Direct 5 years ago  
        
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