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Ignitions and Electrical› Ignition Components

DiamondFIRE Spark Plug

Name: DiamondFIRE Spark Plug
Brand: E3
SKU: E3.58

$8.49

SKU: E3.58

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Overview

The E3.58 is a premium automotive spark plug featuring a 14mm thread diameter and a 0.750” reach with an additional 0.167” skirt extension. This plug utilizes E3's patented DiamondFIRE electrode technology with three legs for enhanced heat transfer and cylinder turbulence.

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The E3.58 Automotive Spark Plug is engineered to deliver optimal performance with its unique design. This plug features a 14mm thread diameter and a 0.750” reach, which is further extended to 0.917” by an integrated skirt just below the threads. The electrode assembly employs E3's patented DiamondFIRE technology, utilizing three legs that secure the electrode to the shell. This construction facilitates superior heat transfer and promotes increased turbulence within the combustion chamber. The DiamondFIRE side wire design is proven to enhance power output, reduce fuel consumption, and improve hydrocarbon emissions over its lifespan. The combination of the unique ground electrode and full-size center electrode ensures consistent performance and is backed by a guaranteed five-year or 100,000-mile lifespan.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	E3
Part Number	E3.58
Category	Ignitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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