Would these work good in a supercharged 04 mustang ?

No. You need a smaller gap like .032 - .035 depending how much boost you got. These are gapped at .059 which would take too much bending to gap it down. NGK says not to change gap more than .008. NGK TR6ix would work better with preset gap at .039

The NGK TR55IX plugs do not fit a 2002 Tahoe, 5.3l flexfuel. Must use the TR5IX. Too many places including parts stores are selling the wrong plug.

I don’t know why you think the TR55IX won’t work, just a slightly cooler plug than the TR5IX. In a lot of climates, it would probably help more than hurt.

What is the gap preset on this plug?

Hi, Set of 8 TR55IX NGK Iridium IX plugs Gap: 1.5mm Heat: "5" Seat: taper NOTE: these are very similar to TR5IX, the difference is: TR5IX have 1.0mm gap and TR55IX have 1.5mm gap. They are the same heat rating, length, etc. NOT SUITABLE FOR Ford TS50 with alloy heads. Hope this info will help you make a decision.

Are these "one piece" spark plugs unlike the three piece design that comes as oem 2005 f150 4.6l?

I installed these plugs in a 2002 Mercury Mountaineer 4.6 liter and they were one piece....easy to install ...make sure you use anti seize compound on the threads...and gap them properly to specs...the motorcraft plugs are prone for breaking off inside the vehicles because they get too hot and become brittle after awhile...and most people dont change them every 40-50,000 miles...definetely recommend the NGK's

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NGK 7164 Iridium IX Spark Plugs TR55IX (8 Pack)

Product ID: 12620812

Details

Brand
NGK
Core Material
Iridium
Thread Size
14mm
Top Material Type
Iridium
Vehicle Service Type
Car Truck

🔥Optimized spark for peak performance

🔧OEM-grade fit for perfect compatibility

⚙️Iridium core for max durability

B/.212

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Description

🔥 Ignite your drive with NGK Iridium IX – where precision meets power!

COMPLETE 8 PACK - Ready for full engine tune-up, ensuring all cylinders fire flawlessly for maximum power.
OEM PRECISION FIT - Engineered to match original equipment specs for seamless installation and optimal engine performance.
PERFORMANCE BOOST - Enhances combustion efficiency for smoother starts and improved fuel economy.
IRIDIUM POWERHOUSE - Premium iridium tip ensures longer life and consistent ignition, reducing maintenance frequency.
RELIABLE LONGEVITY - Trusted by manufacturers worldwide, delivering unmatched durability under demanding conditions.

NGK 7164 Iridium IX Spark Plugs (8 Pack) combine OEM-level quality with iridium-tipped durability, delivering superior ignition performance and longevity. Designed for vehicle-specific fit, these spark plugs enhance engine efficiency and reliability, making them a top choice for professional-grade automotive maintenance.

Specifications

ASIN	B0033I4W6E
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#33,840 in Automotive ( See Top 100 in Automotive ) #205 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Car, Truck
Core Material	Iridium
Customer Reviews	4.8 4.8 out of 5 stars (698)
Included Components	7164
Item Highlight	Replaces 12 14 15 16 SP432 41-902 41-913 41-919 41-929 41-931 41-932 41-936 41-942 41-943 41-947 41-952 41-974 241-902.
Item Weight	11.52 ounces
Manufacturer	NGK
Manufacturer Part Number	7164 TR55IX
Manufacturer Warranty Description	Includes manufacturer provided warranty
Model Number	7164
Number of Items	8
OEM Equivalent Part Number	FORD%1315691
Thread Size	14mm
Top Material Type	Iridium
UPC	087295071649
Unit Count	1 Count

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