Tuner Harness Plug Kits & DPF Delete Dummy Plugs

Why Does Your Diesel Truck Need a Tuner Harness Plug Kit?

Open Connectors Wick Water Into the Harness

Every sensor unplugged during a delete leaves a live connector hanging in the engine bay. Road spray, salt, and pressure washing drive water straight down the pins, and the corrosion that follows travels back through the harness instead of staying at the connector.

Wet Pins Become Fault Codes

Corroded circuits read wrong to the ECM, and the truck answers with sensor circuit faults and check engine lights that chase you around long after the delete is tuned. A capped connector never starts that chain, which is the whole point of the kit.

A Clean Bay Sells the Truck

Taped-up or zip-tied connectors scream half-finished build. OEM snap-in caps make the harness look factory-delivered, which matters at resale and matters every time the hood opens.

What Can a Tuner Harness Plug Kit Solve?

Weatherproof Sealing, Zero Wiring Work

Each DPF delete dummy plug kit seals its connectors to IP67 with OEM-style snap-in fit, no cutting or splicing anywhere in the job. The caps seat with hand pressure and stay seated through heat cycles, washes, and winter salt.

Dielectric Grease Only

• Seal Quality: Good at first, dries out
• Lifespan: Months
• Engine Bay Look: Messy

Electrical Tape

• Seal Quality: Poor, unravels with heat
• Lifespan: Weeks
• Engine Bay Look: Amateur

DIY Glove-Finger Caps

• Seal Quality: Fair until first heat cycle
• Lifespan: Weeks to months
• Engine Bay Look: Improvised

IP67 Snap-in Caps

• Seal Quality: Sealed against wash and salt
• Lifespan: Life of the truck
• Engine Bay Look: Factory-delivered

Shibby-Fit Replacements at Direct Pricing

The connectors these kits cap follow the Shibby Engineering plug kit layouts that most delete builds already use, so every cap indexes the same connector bodies and locks the same way. You get the same fit at direct pricing, kit by kit, platform by platform.

Complete the Build, Not Just the Plug

The plugs finish a job that starts with hardware and tuning. Upgrading your exhaust? Our DPF delete pipes pair with these caps, and the EGR delete side of the build leaves its own connectors that need sealing. Order the plugs with the hardware and the whole job closes in one weekend.

Shop Tuner Harness Plug Kits by Engine

1. Ford 6.7L Powerstroke (2011-2025)

Focus: This category focuses on the five 6.7L Powerstroke generations, each with its own connector layout.

Solves: It solves the year-mismatch problem that causes most returns, because every generation from 2011 to 2025 gets its own kit.

• Tuner Harness Plug Kit for 6.7L Powerstroke Shibby Engineering Ford F250 F350 (2011-2014) - Fits the 6.7L Powerstroke in Ford F250 F350 (2011-2014). First-generation caps for the early connector layout.
• Tuner Harness Plug Kit for 6.7L Powerstroke Shibby Engineering Ford F250 F350 (2015-2016) - Fits the 6.7L Powerstroke in Ford F250 F350 (2015-2016). Mid-generation caps matching the updated sensor set.
• Tuner Harness Plug Kit for 6.7L Powerstroke Shibby Engineering Ford F250 F350 (2017-2019) - Fits the 6.7L Powerstroke in Ford F250 F350 (2017-2019). Second-generation caps for the refreshed electronics.
• Tuner Harness Plug Kit for 6.7L Powerstroke Shibby Engineering Ford F250 F350 (2020-2022) - Fits the 6.7L Powerstroke in Ford F250 F350 (2020-2022). Third-generation caps for the updated harness ends.
• Tuner Harness Plug Kit for 6.7L Powerstroke Shibby Engineering Ford F250 F350 (2023-2025) - Fits the 6.7L Powerstroke in Ford F250 F350 (2023-2025). Current-generation caps for the newest connector bodies.

2. Ford 6.4L Powerstroke (2008-2010)

Focus: This category focuses on the 6.4L Powerstroke, whose twin-cooler deletes leave several connectors open at once.

Solves: It solves the exposed-connector pileup in the tight 6.4L bay with one matched cap set.

• Tuner Harness Plug Kit for 6.4L Powerstroke Shibby Engineering Ford F250 F350 (2008-2010) - Fits the 6.4L Powerstroke in Ford F250 F350 (2008-2010). Caps sized for the 6.4L sensor and cooler connectors.

3. Ram 6.7L Cummins (2007.5-2024)

Focus: This category focuses on the 6.7L Cummins in Ram 2500 and 3500, split across five hardware eras.

Solves: It solves the emissions-era mismatch because each routing change from 2007.5 to 2024 gets its own kit.

• Tuner Harness Plug Kit for 6.7L Cummins Shibby Engineering Dodge RAM 2500 3500 (2007.5-2012) - Fits the 6.7L Cummins in Dodge RAM 2500 3500 (2007.5-2012). Caps for the first-generation 6.7L layout.
• Tuner Harness Plug Kit for 6.7L Cummins Shibby Engineering Dodge RAM 2500 3500 (2010-2012) - Fits the 6.7L Cummins in Dodge RAM 2500 3500 (2010-2012). Late first-era caps for the updated connector set.
• Tuner Harness Plug Kit for 6.7L Cummins Shibby Engineering Dodge RAM 2500 3500 (2013-2015) - Fits the 6.7L Cummins in Dodge RAM 2500 3500 (2013-2015). Mid-era caps matching the revised emissions wiring.
• Tuner Harness Plug Kit for 6.7L Cummins Shibby Engineering Dodge RAM 2500 3500 (2016-2018) - Fits the 6.7L Cummins in Dodge RAM 2500 3500 (2016-2018). Pre-refresh caps for the 2016-2018 harness.
• Tuner Harness Plug Kit for 6.7L Cummins Shibby Engineering Dodge RAM 2500 3500 (2019-2024) - Fits the 6.7L Cummins in Dodge RAM 2500 3500 (2019-2024). Current-era caps for the latest connector bodies.

4. GM Duramax LML and L5P (2011-2023)

Focus: This category focuses on the LML and L5P Duramax in Chevy and GMC HD trucks.

Solves: It solves the GM-specific connector differences between the two generations with dedicated kits.

• Tuner Harness Plug Kit for LML 6.6L Duramax SHIBBY ENGINEERING 2011-2016 GM - Fits the 6.6L Duramax LML in Chevy GMC Silverado Sierra HD (2011-2016). Caps for the LML sensor and DEF connector layout.
• Tuner Harness Plug Kit for 6.6L L5P Duramax Chevy GMC (2017-2023) Replacement for Shibby Engineering - Fits the 6.6L Duramax L5P in Chevy GMC Silverado Sierra HD (2017-2023). Direct-replacement caps for the L5P harness ends.

The L5P delete leaves more than a dozen connectors open at once, more than any other platform in this collection, which is why that truck eats harnesses fastest when the caps get skipped. The L5P kit exists because of exactly that pile of open ends.

5. Ram 3.0L EcoDiesel (2014-2019)

Focus: This category focuses on the 3.0L EcoDiesel V6 in the Ram 1500.

Solves: It solves the compact-bay connector exposure on the half-ton diesel with a platform-specific set.

• Tuner Harness Plug Kit for 3.0L EcoDiesel Shibby Engineering Dodge RAM 1500 (2014-2019) - Fits the 3.0L EcoDiesel in Dodge RAM 1500 (2014-2019). Caps matched to the EcoDiesel sensor connectors.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

Premium Quality & Rigorous Testing

Our EGR, DPF, and CCV delete kits are engineered from premium-grade materials and subjected to brutal quality control and field testing. Unlike generic alternatives, our products are built to withstand extreme heat and pressure, delivering unmatched durability and long-term stability when your rig needs it most.

20 Years of Proven Diesel Expertise

We aren't just selling parts. We live in this industry. With two decades of hands-on experience providing specialized modification solutions for heavy-duty truck owners, our upgrades have been extensively proven across every driving environment, from daily towing to high-performance tracks.

Industry-Leading Standards

We work hand-in-hand with top-tier industry partners and reputable organizations. Every product we design, test, and ship meets or exceeds strict industry standards, ensuring your Powerstroke, Cummins, or Duramax gets the exact precision it deserves.

Real Results, Proven Track Record

Thousands upon thousands of diesel owners trust us to unlock their engine's true potential. Our massive library of positive customer feedback and successful build case studies proves one thing: our kits deliver real horsepower, lower EGTs, and flawless reliability in the real world.

Engine Architecture Notes Behind Tuner Harness Plug Kits

Connector layouts change with the emissions hardware, which is why the year splits in this collection look the way they do. The 6.7L Powerstroke splits five ways: 2011-2014, 2015-2016, 2017-2019, 2020-2022, and 2023-2025, because Ford revised the sensor set and harness ends at each generation line.

The 6.7L Cummins splits at the 2013, 2016, and 2019 emissions updates, and the Duramax splits at the LML-to-L5P changeover in 2017, when GM reworked the sensor and DEF connector bodies.

Order by engine and model year, never by look-alike photos. A cap that fits a 2015 connector will not lock into a 2017 body, and a wrong-size cap seals nothing. Every kit in the grid above matches one platform and one era, exactly.

Maintenance Tips for Tuner Harness Plug Kits

Keep the sealed harness sealed with five habits:

• Reseat caps after washes: Pressure washing can back a snap-in cap out a few millimeters, so press each cap home after every wash bay visit.
• Check at oil changes: A ten-second glance at the capped connectors catches a loose cap before road spray does.
• Keep dielectric grease in the caps: A thin film inside each cap keeps the pin cavity sealed against humidity year-round.
• Inspect after off-road runs: Mud and vibration work on snap-in locks, so reseat anything that looks proud of its housing.
• Re-verify after service work: Technicians unplug things, so confirm every cap is back in place before the truck leaves the shop.

Off-Road Use Statement for Tuner Harness Plug Kits

The plug kits themselves are harness protection parts, which carry no emissions restriction. The delete hardware they complete is different: emissions delete hardware is not legal on public roads, removing or defeating an emissions control device is tampering under federal law, and those parts are intended for competition and closed-course off-road use only, not street registration, inspection, or daily on-road driving.

The delete hardware also has to be paired with delete-capable tuning, because the ECM will set codes and cut power the moment it stops seeing the components that were removed.

FAQs About Tuner Harness Plug Kits & DPF Delete Dummy Plugs

What is a tuner harness plug kit for?

A tuner harness plug kit caps and seals the factory connectors left unplugged after an EGR or DPF delete, including the EGT sensor, EGR valve and DEF pump connectors. Each cap is a weatherproof, OEM-style snap-in seal, so the open harness ends stay dry and clean with no cutting or splicing.

Why use harness plugs after an emissions delete?

Because an open connector is a water inlet. Rain, road spray and pressure washing wick straight down the pins, and the moisture and corrosion that follow show up as sensor circuit faults and check engine lights, or worse, damage that travels back toward the ECM. Capping every dangling connector the day the hardware comes off prevents the entire chain.

Are these compatible with Shibby Engineering plug kit setups?

Yes. The caps follow the Shibby Engineering connector layouts that most delete builds already run, so they index the same connector bodies and lock the same way, kit for kit. The L5P listing is even titled as a direct replacement for the Shibby Engineering set.

Which kit fits my 6.7 Cummins?

Match the kit to your model year: 2007.5-2012, 2010-2012, 2013-2015, 2016-2018 and 2019-2024 each get their own cap set. The emissions routing and connector bodies changed at those split points, so the year range in the title is the fitment, not a suggestion.

Is there a plug kit for my 6.7 Powerstroke?

There is one for every generation: 2011-2014, 2015-2016, 2017-2019, 2020-2022 and 2023-2025, plus a dedicated set for the 2008-2010 6.4L. Ford revised the harness ends at each generation line, which is exactly why the collection splits five ways.

Do the kits include the DEF plug?

Some do and some do not, because each platform leaves a different set of connectors open. Every product page lists exactly which connectors its kit caps, so confirm the DEF pump connector is in that list before ordering if your build needs it. Our 24/7 support can verify it from your truck's details in one message.

Will water in an open connector actually hurt anything?

It will. Water wicks down the pins by capillary action, and copper corrosion starts within weeks of the first wet cycle. The faults arrive as sensor circuit and NOx-related codes first, and left alone, the moisture path works back toward the ECM, where the repair bill stops being cheap.

Are these plugs street legal?

The plugs themselves are harness protection parts with no emissions function, so they carry no restriction. The delete hardware they complete is different: those parts are for competition and closed-course off-road use only, and they require delete-capable tuning so the ECM stops watching for the removed components. Confirm fitment and local rules before you order.

How do I install the caps?

The forum-proven sequence is three moves: fill each open connector with dielectric grease, snap the weatherproof cap over it, then zip-tie the harness up high and out of the road spray. Grease alone dries out, tape unravels, and glove-finger DIY caps quit at the first heat cycle; the snap-in cap is the permanent leg of the ritual.

The caps themselves snap in by hand over the factory connector bodies, no tools, no cutting, no splicing, and the whole set installs in minutes once the delete hardware is out.

What shipping, warranty and returns apply?

Every kit ships free to US addresses from our warehouses in California, Texas, Ohio and New Jersey, carries a 1-year warranty against defects, and is covered by the 45-day return policy. If a cap set does not match your truck's connectors, our 24/7 support makes it right.