-2 Step_Pack of (6)_ HalferLand' Honda J-Series Ultra Performance -2 Step Colder Iridium Spark Plugs (Heat Range 8 )_ PERFECT FOR BOOST/NITROUS/HIGH HP NA MOTORS *Up to 700hp* (FREE SHIPPING)

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Most Affordable Performance Plug on the Market


Perfect for Boosted, Nitrous, High HP motors up to 700HP


-2 step colder (Heat 8) Plug to help with Pre-Ignition/Knock


5 Year Manufacturer Warranty on any defects (Daily Driven Motors ONLY, Not Race Motors!)

Feature 5

Designed by HalferLand Performance Product
HalferLand Performance
_Ultra Performance -2 Step Colder Plugs_
*Perfect for Boost, Nitrous and High HP NA motors* 
*Up to 700HP*

Gen 1 and Gen 2 J-Series Engines ONLY
Gen 1 = J30a1, J32a2, J35a1-a4
Gen 2 - J30a4-5, J32a3, J35a5-a8, J37a1

PACK OF (6) 
 (Package will contain (6) Individual Spark Plugs)

Product Description

When it comes to performance, every aspect of the motor and setup plays a huge role in whether the vehicle will be reliable or if it will be plagued with issues. Sparks Plugs are one of the key factors in the motors overall health and ability to function. With that in mind we set out to once again, as we do with all of our HalferLand Performance Products, to find the best Performing Spark Plug we could design, at a more affordable price then currently on the market. We have worked with the manufacture from the ground up applying tried and true methods to the plug, while also adding a few innovative designs we feel will aid the Plug in functioning that much better in high stress, daily situation. One of those features is the addition of the iridium tip strap. Unlike other flat straps you see on most spark plugs, our strap have an additional piece of Iridium applied to the underside of the strap where the spark occurs, thus allowing for a stronger arc between the two pieces of metal and potentially eliminating boost/air "Blow Out" of the spark. This is even more important in boosted application. To be sure you're Spark Plugs are set up to the best specification, please refer to our Spark Plug Gapping chart below. All of our plugs come with the standard OEM Honda Gap and will need to be gapped by the end customer for their particular HP and setup. Our spark plugs Heat Range is based off the NGK formula, the higher the number the colder the plug is (these are heat range 8,  stock heat is 6, that makes these -2 step colder)..... NGK is a tried and true spark plug, so we used the same general theme of their plug, adding in our subtle yet effective improvements (IE. Our Iridium Strap), all the while our cost coming in at more then 25% lower then most Iridium Spark Plugs on the market!!! 
(If you have a Stock or Bolt-on NA motor, please check out our "NA" Heat 6 Spark Plug in our "Tuning_ECU_Electronics" Category of the store for that listing)

HalferLand Performance Spark Plug Gap Chart 
(These specs will vary, it's best to consult with your engine builder if unsure about your situation!!!). These specs are in place to guide you as a general rule of thumb and is NOT the "Rule All" specs. We are not liable for any mishaps from our data being used. General Rule is if you're getting Spark Blow Out, you need to gap down your plugs as the air is blowing the spark out. 

Motor Type & HP  Compression   Suggested Heat Suggested Gap
NA - Up to 325WHP

Up to 11:1    Heat 6 (Stock) Stock .028-.030"
NA or Boost - 325-450WHP 10:1 - 11:1   Heat 7 (-1 step colder) .022"-.025"

NA or Boost - 325-450WHP

11.5:1 - 13:1
Heat 7/8 (-1 or -2 Step Colder)

Boost - 500-700WHP

10:1 - 11:1

Heat 8 or 9 (-2 or -3 Step Colder)

.015"- .018"

 Boost - 500-700WHP

11.5:1 - 13:1
Heat 9 or 10 (-3 or -4 Step colder)
.015"- .018"
Consult Builder at this Level!!        
Boost 750WHP - 850WHP  10:1 - 11:1   Heat 9 or 10 (-3 to -4 Step colder) .010" - .015"

Boost 750WHP - 850WHP 
11.5:1 - 13:1   Heat 10 (-4 Step colder) .010" - .015"

850 - 1000WHP +++   


  • Thread Size: 14mm
  • Thread Pitch: 1.25mm
  • Seat Type: Gasket
  • Resistor Value: 5K Ohm
  • Reach: 19mm (3/4")
  • Hex Size: 5/8" (16mm)
  • Terminal Type: Solid
  • Overall Height: ISO
  • Gap: .031" (0.8mm)

Center Electrode

  • Material: Iridium
  • Type: Fine Wire
  • Size: 0.6mm
  • Projection: Projected

Ground Electrode

  • Material: Nickel
  • Type: Standard
  • Shape: Taper Cut
  • Quantity: 6


  • Warranty: 1 Year (Limited to Defects in Daily Driven Motors.  NO RACE MOTORS)
  • Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.
  • Brand: HalferLand Performance
  • Heat Range: 8
  • Longevity: 50k Miles
  • Resistor: Yes
5 Stars
Boost Boost Boost...perfect for boost
Did you find this helpful?  3 of 3 Found Helpful
Reviewed by:  from MI. on 9/30/2019
5 Stars
I was recommend to Halferland by a friend. It was about time for new plug in my Turbo 6th gen and took a shot on these. No power loss, if anything the car feel better. Def will recommend to others.
Did you find this helpful?  3 of 3 Found Helpful
Reviewed by:  from Detroit . on 10/17/2019
5 Stars
I installed them in my Turbo TL...run perfect and better price then NGK . Cant complain.
Did you find this helpful?  2 of 3 Found Helpful
Reviewed by:  from 1. on 3/14/2020
5 Stars
Two Step Colder
I've been installing a super charger kit on my 03 Accord J30A4 for the passed few days. Havent quite finished yet but these spark plugs are certainly a needed part of the install. These were the only colder plugs i found being sold in a set of 6. I've been working with Halferland since October of last year. They got me programmed, flashed and in the tuning process.. it's been very satisfying. ..cant wait to get back to it once I'm done with this installation.
Did you find this helpful?  2 of 3 Found Helpful
Reviewed by:  from Van Nuys. on 7/17/2020
5 Stars
Did you find this helpful?  0 of 1 Found Helpful
Reviewed by:  from QUEBEC. on 11/14/2020

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