STM Spark Plug Gapper Tool

STM Tuned Inc.



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The STM Spark Plug Gapping Tool allows for easy handling of your spark plug and gauge for for a smooth, controlled and precise gap. So you can stop banging your plugs on random hard surfaces! Please confirm the thread size for your plugs before purchase.

Vehicle Fitment:
• For 12mm or 14mm spark plug threads
• See fitments below

• USA-made
• Billet aluminum
• Super easy to use tool

12mm Gapper Tool for:
Mitsubishi Lancer Evolution X
Nissan R35 GT-R
Nissan 350Z 2007 - 2009
Nissan 370Z 2009 - 2016
Infinity G35 11/2006 - 2008
Infinity G37 2008 - 2013
Subaru BRZ
Scion FR-S
Subaru 2015+ FA20 WRX

14mm Gapper Tool for:
Mitsubishi Lancer Evolution 1/2/3/4/5/6/7/8/9
Mitsubishi 1G/2G DSM (Eclipse/Talon/Laser)
Mitsubishi 3000GT
Dodge Stealth
Subaru STi 2004-2018
Subaru WRX 2002 - 2014
Nissan 350Z 2003 - 2006
Infinity G35 2003 - 10/2006
Ford Focus ST 2013 - 2017
Ford Focus RS 2016 - 2017
Lamborghini Huracán
Lamborghini Gallardo
Audi R8 V8/V10
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Customer Reviews

Based on 10 reviews
Constantino Cuico (Houston, TX, US)
Spark plug gapper

Purchase them both sizes so far it work good
Thanks STM

Daniel Salazar (Lima, LMA, PE)
products ok

Good recommended product

Benjamin Beaird (Columbiana, AL, US)

Very nice machined piece! It lets you precisely dial in your plug gap instead of just getting it close.

Tony Agosti (Des Moines, IA, US)
Spark plug gapper

Simple, ingenious tool. Just makes life easier

Dmitry Stankov
Nice tool

It's a shame no one sells something like this here in Russia. Only those coin type ones, which are pretty much useless for a laser iridium spark plugs.
No more C-clamp as a gap tool:)
BTW, it would be nice if thread size was embossed somewhere on the tool to identify the thread on first sight, instead of checking every time manually (since there are more than one option available).

Cancer and Reproductive Harm