Product images and videos 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.

Ignitions and Electrical› Ignition Components

HKS

Iridium Spark Plug

Name: Iridium Spark Plug
Brand: HKS
SKU: M45iL

$154.23

SKU: M45iL

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Easy — 1–2 hours

Overview

The HKS M45IL is a set of high-performance iridium spark plugs. They also feature anti-carbon build-up properties.

Show original supplier description

The HKS M-Series Super Fire Racing spark plugs, specifically the M45iL model, are high-performance Iridium plugs engineered to support advanced tuning levels in 3.3T platforms like the Kia Stinger and Genesis G70. Featuring a 0.6mm Iridium Alloy Center Electrode, these spark plugs reduce voltage requirements while simultaneously improving ignition performance and longevity. The outer electrode incorporates a square platinum chip for added durability, which, when paired with the iridium center electrode, boosts overall ignition effectiveness. An anti-vibration design in the short-type outer electrode decreases weight and increases resistance to vibration, thereby improving the electrode's lifespan. To combat carbon buildup, which can lead to misfires after prolonged idling or varying combustion conditions, the spark plugs utilize a Thermal Edge on the ceramic insulator and a Spark Support Gap to help discharge carbon deposits.

Vehicle Symptoms

Rough idle at stoplights
Engine hesitation during acceleration
Decreased fuel economy
Hard starting in cold weather
Misfire under load

Diagnostic Codes

P0300 – random misfire
P0301 – cylinder 1 misfire
P0302 – cylinder 2 misfire
P0303 – cylinder 3 misfire
P0304 – cylinder 4 misfire
P0305 – cylinder 5 misfire
P0306 – cylinder 6 misfire

Relevant Conversations

rough idle Kia Stinger 3.3T fix
P0300 code Stinger spark plugs
HKS M45iL spark plug review
best spark plugs for Kia Stinger 3.3TT
how to change spark plugs Stinger
spark plug gap for HKS M45iL
Kia Stinger misfire after tune
HKS vs NGK iridium spark plugs
spark plug replacement interval Stinger
coil packs and spark plugs Stinger upgrade

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

Brand	HKS
Part Number	M45iL
Category	Ignitions and Electrical

Videos

Kia Stinger GT / G70 - Spark Plug Install

KIA Stinger GT 3.3TT HKS spark plug install

KIA STINGER MODS YOU SHOULDNT WAIT TO INSTALL - JB4, HKS M45IL, INJEN INTAKE, SXTH ELEMENT CATCH CAN

How to install spark plugs on a Kia Stinger without removing the intake manifold--HKS M45iL Plugs

5,000+ Trusted brands

1M+ Enthusiasts

5M+ Parts sold

(760) 282-4645 hello@motormia.co

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy