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HT0 Spark Plug (05-08 GT)

Item 64201
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$89.99 (set)

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      Review & Installation Video

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Perfect for Nitrous and Force Inducted Engines
      • Colder Heat Range
      • Copper Core with Platinum Tip
      • Fits 2005-2008 GT's w/ Black Coil Boots
      • Sold as a Set of 8


      More Power. When you add nitrous, superchargers, or turbos to your Pony you need the correct spark plug to maximize the horsepower benefits available from these modifications. That is where Autolite "HT0" Spark Plugs come into play, these plugs are specifically designed for applications that require one step colder heat range.

      Superior Materials. Autolite Spark Plugs have a thin profile design with a copper core for its superior conductivity and a durable platinum tip to assure a strong spark and a long life to keep your performance Pony running at it's peak power.

      Application. This set of eight (8) Autolite HT0 Spark Plugs are specifically designed as an upgrade for nitrous or force inducted 2005 to 2008 GT Mustangs. These plugs are factory gaped at 0.045 inch.

      Fitment: 2005 2006 2007 2008 Details

      MPN# HT0


      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (40)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 40 customers

      Installation Time: Less than 1 Hour

      Installation Cost: 0-$100

      • January 27, 2020

        1 2007 GT - DavidJ

        Blew my motor

        Blew my motor Tip of the spark plug came loose and went into my engine blew up my motor

        Helpful (0)
      • September 15, 2019

        1 2005 GT - LarryL Installation Time: Less than 1 Hour


        I’ve had for less than a month and already have a misfire on cylinder 4

        Helpful (0)
      • April 06, 2019

        5 2007 GT - LoveMyGT Installation Time: Less than 1 Hour


        Got them all off and on within two hours I think, starts every time, I have to change the coils to ensure great start, then the fuel injectors, then the wiring harnesses that connects each terminal to terminal, and then , there’s much to to

        Helpful (0)
      • April 02, 2019

        5 2005 GT - EdwardG Installation Time: Less than 1 Hour

        HTO Spark Plugs

        These are recommend for my supercharged Roush Mustang and have had used them previously and they performed excellent. I'm currently upgrading my coil packs so I am replacing with again the HTO spark plugs so everything is new for my ignition systems.

        Helpful (0)
      • February 13, 2019

        5 2006 GT - GARRYH Installation Time: Less than 1 Hour


        Great plugs, the original HT0 had 50,000 miles on them, still good but decided to change them since I was working on the car. Forced induction (supercharger), gapped the plugs at .030.... Soaked down the old plugs with Nut Buster for 24 hours prior to removing and none broke off...

        Helpful (2)
      • December 28, 2018

        5 2006 GT - SBarros92 Installation Time: Less than 1 Hour

        Great choice

        Perfect fitment. Running 100 better now! Very satisfied with these plugs.

        Helpful (4)
      • December 19, 2018

        5 2006 GT - DanL Installation Time: Less than 1 Hour

        HTO plugs

        I received the spark plugs quickly and they were exactly as descibed

        Helpful (4)
      • November 29, 2018

        5 2006 GT - JamarisS Installation Time: Less than 1 Hour

        Great product

        Car was puttering all over the place with old stock plugs , put these bad boys in and she runs like a brand new car . Also feel a little more throttle .

        Helpful (5)
      • August 26, 2018

        5 2007 GT - 07GTAF Installation Time: Afternoon

        Worked great, eliminated detonation!

        Replaced factory plugs with these, had minor detonation even w/93 octane ... all stock. Replaced plugs, runs great, cut detonation down to almost nothing. Perfect! PB Blast the old plugs for a few hours, the get a good fitting 9/16 socket on cold motor, by hand, go slow ... no broken plugs.

        Helpful (7)
      • June 27, 2018

        5 2008 Bullitt - Albert Installation Time: Shop Install Installation Cost: 0-$100

        Edelbrock Stage 1 Mod Package

        My mechanic said to buy these. I did and my 2008 Bullitt runs better than ever. Great fun to drive.

        Helpful (6)

      Questions & Answers (9 answers)

      5 Top Rated Questions

      Hey, cools stuff. Im here in Phoenix AZ where its stupid HOT over 105 plus for 4mths, would running these plugs here help in keeping it cool when out playing??? if not what would be the best plug ? NO boost, just cold air intake with better flow exhaust, 2006 GT convertible. thx dan

      • We do not recommend running these for your setup, as you do not have forced induction.

      Helpful (0)

      I have longtubes, cai, tune, can i daily these an have no problems

      Which plugs should I use with MSD blaster coil packs?

      • When upgrading spark plugs, we generally recommend checking with your tuner.

      Helpful (0)

      will these work with aftermarket cam (stage 2) a tune and headers?

      • This would be more ideal for Mustangs that have a supercharger, turbo or nitrous kit. These spark plugs wouldn't be beneficial for the modifications you have on your Mustang currently.

      Helpful (0)

      Will these plugs work well with my 06 gt stock everything?

      • Hello! This set of eight (8) Autolite HT0 Spark Plugs are specifically designed as an upgrade for nitrous or force inducted 2005 to 2008 GT Mustangs. These plugs are factory gaped at 0.045 inch. They would not be a good option or necessarily even work on a stock GT.

      Helpful (0)
      Post Your Question
      4 More Questions
      i see that these plugs are good for nos. but i daily drive my mustang and drag it every now and then so i would like to know if these plugs are good for when i daily my mustang and do not use my nos! 1 answer
      Are these 2 piece like OEM for the 3V head or are they one piece plugs? 1 answer
      Use without NOS or an S/C? I have a few upgrades but I'm not running NOS or a S/C and I would like to put some better plugs in other then the 2 piece OEM plugs will these work fine in my stang or give me more headache then performance? Thanks for the help. 1 answer
      Can i use these spark plugs even though i cant get supercharge yet? Im due for some new sparkplugs, 82,xxx miles. What plugs do u recommend? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (8) Spark Plugs

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 08
      • GT - 05, 06, 07, 08

      Intended for use with nitrous, turbo, or supercharged applications

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