Best Diesel Tuners for 6.7 Cummins: Top Picks for Power & MPG

Which Tuner Fits Your 6.7 Cummins Model Year?

The Ez Lynk Auto Agent 3 fits 2007.5 through 2021 Dodge Ram trucks with the Cummins 6.7L. The EFI Live Autocal V3 fits 2007 through 2021 Dodge Ram trucks. The RaceMe Ultra fits 2007 through 2021 Dodge Ram trucks. The RaceMe Ultra does not fit Cab & Chassis trucks.^[2] The 2022-2024 Cummins Delete Tuning Kit fits 2022, 2023 and 2024 Ram trucks. It fits pickups only, not Cab & Chassis.^[1]

The three tuners for 2007-2021 trucks

Here's the thing — on a 6.7 Cummins, the model year decides more than any feature list ever will. Pick the wrong one and you're starting over before the first bolt comes loose. Three tuners share most of that window, and one of them starts half a step later.

The Ez Lynk Auto Agent 3 starts its run at 2007.5 rather than 2007. If your truck sits right on that early edge, pin down the exact model year before you go any further. It's a quick check that saves a long week.

Pickup or Cab & Chassis: where the lists split

Model year is check one. Body style is check two, and it's where these tuners part ways.

Start with the Ez Lynk Auto Agent 3, built for the Dodge Ram. It fits 2500, 3500, 4500, and 5500 models, though Cab & Chassis trucks won't include Shift on the Fly.^[3] On a big Cab & Chassis build, that's a trade worth weighing before you fall for the switch.

The table below lays out the full split, row by row. Don't skim the last column.

2022-2024 trucks: one kit

Newer truck? Then the shortlist is a list of one. On a 2022 through 2024 Ram, the 2022-2024 Cummins Delete Tuning Kit is the one that fits. Fits pickup models only, all cab and box lengths; does not fit Cab & Chassis trucks.^[1]

Checking your truck against the table

Two checks, in order: model year first, then pickup or Cab & Chassis. Find your row, read across, and you'll know which tuners are even in the running.

Which row is yours? Lock it in before you look at a single price.

What Does a Complete 6.7 Cummins Tuner Setup Actually Cost?

The EFI Live Autocal V3 is priced from $1,034.00 to $1,234.00. The RaceMe Ultra runs from $1,634.00 to $1,934.00. The Ez Lynk Auto Agent 3 comes in at $1,824.00. The 2022-2024 Cummins Delete Tuning Kit sits higher, at $5,899.00. The Tuner Harness Plug Kit, the one add-on, is priced from $169.00 to $219.00.

The three 2007-2021 tuners

Let's break it down. The table shows the gap on price, but the sticker isn't the only thing that separates them. A PC-built tune, a phone app or a screen on the dash: that's the real choice, and the sections below sort it out.

The 2022-2024 kit

Don't line the newer-truck kit up against the tuners price for price. It's a different box with different hardware inside. The kit section further down walks through every piece, so you can see where the money goes.

The plug kit as the add-on

Think of the one add-on as the finishing touch, not an afterthought. It deals with the connectors a delete leaves hanging, and it gets its own section below. It won't add a single horsepower, and it isn't meant to.

Built to order: check fitment first

Here's where a wrong guess gets expensive. Take the RaceMe Ultra, built for the Dodge Ram. Tuners are built to order and not refundable once the tune is created.^[2]

So run the model-year check and the body-style check before anything else. A careful look at the table up top beats a tune you can't send back.

How Does a Tuner Change the 6.7 Cummins?

The electronic engine control unit is the central controller and heart of the engine management system.^[4] The EZ Lynk Auto Agent 3.0 Delete Tuner for the 2007.5-2021 Ram 6.7 Cummins reprograms your ECM to permanently remove DPF, EGR, DEF, CAT, SCR, DOC, and EGT monitoring commands.^[3] That clears every emissions code, ends regen cycles, and kills limp mode for good.^[3]

What the ECM controls

Think of the ECM as your truck's brain. It controls the fuel supply, air management, fuel injection and ignition.^[4] Change what that brain is told, and the whole engine answers differently.

That's the whole trick. A tuner doesn't bolt anything onto the engine; it rewrites the instructions the engine already follows.

Phone app or preloaded device

Here's the split you'll notice every time you climb in. The Auto Agent 3.0 plugs into your OBD-II port under the steering wheel, then your custom VIN-specific tunes download from the cloud and install to the ECM.^[3] There's no screen on the device, so you run everything from any Apple or Android phone through the Auto Agent 3 app, including live metric monitoring and reading or clearing DTC codes.^[3]

You can revert to factory settings if you ever need to.^[3] That's a handy safety net to keep in your back pocket.

The RaceMe Ultra Delete Tuner for the Ram 6.7 Cummins arrives preloaded with your custom delete tunes, so you plug it into your OBDII port, follow the instructions, and your truck's ECM is reprogrammed to run without the DPF (Diesel Particulate Filter), DEF (Diesel Exhaust Fluid), and EGR (Exhaust Gas Recirculation) system.^[2] No laptop, no dealership, no downtime.^[2]

What changes once the tune is in

The Ultra also runs a live engine monitor for boost, EGT, RPM, and load, includes 68RFE transmission tuning, gets monthly firmware updates, and has an ECM recovery function if a programming sequence is disrupted.^[2] Once the tune is installed you can pull the DPF, DEF tank, and EGR hardware with no check engine lights or "See Dealer" codes.^[2]

What does that feel like from the driver's seat? A quiet dash between rounds, and no regen cycle butting in halfway through a session on the dyno. That's the payoff most guys are really after.

How Much Power Does Each Tuner Add?

The Ez Lynk Auto Agent 3's custom tunes carry five power levels: Stock, +40HP, +80HP, +120HP, and +160HP.^[3] The EFI Live's 2007–2018 tune carries +0, +65, +100, and +130 HP levels; 2019–2021 runs +0, +45, +70, and +100 HP without shift-on-the-fly.^[5] The 2022-2024 Cummins Delete Tuning Kit follows. Six shift-on-the-fly power levels let you tune for the moment: stock (+0HP) for best MPG, then +30, +60, +120, +150, and +180HP.^[1]

The Ez Lynk's five levels

Buckle up, because this is the section most of you skipped ahead to. Five steps, stock to the top, and nobody says you have to live on the top rung. Bottom rung while the truck warms up in the pits, top rung for the pass that actually counts.

Here's the thing — the biggest number isn't automatically the right one. Match the level to what the rest of your build can take, and the workhorse under the hood stays happy for the long haul.

The EFI Live: two ladders by model year

Look closely and you'll spot two ladders, split by model year. The newer one stops lower and drops the on-the-fly switching, so the level you pick is the level you run until you change it.

Which half does your truck sit in? That one answer decides how much shove you're really choosing between.

The 2022-2024 kit's six levels

Six levels on the newer trucks, and the top one is the biggest number in this guide. Think of that ladder as a gear selector for power: stock while you idle through the pits, the upper rungs when the flag drops.

You don't have to use all of it. You just have to know it's there.

Cab & Chassis trucks on the EFI Live

Running a 4500 or 5500 with the EFI Live Autocal V3? Fits 2007–2021 Ram 2500/3500/4500/5500.^[5] Cab & Chassis 4500/5500 trucks get a single +0 HP file — confirm before ordering.^[5]

A single file means no ladder at all. If power is the whole point of your Cab & Chassis build, that changes the math, so ask before you commit.

Which 6.7 Cummins Tuner Gives the Best MPG?

First, the Ez Lynk Auto Agent 3. Most owners report a 5 mpg increase on average and far fewer trips to the shop.^[3] Next, the EFI Live Autocal V3. Owners report a 5 MPG increase on average.^[5] Last, the RaceMe Ultra. Many customers report 3-5 MPG fuel economy gains once DPF backpressure and regen fuel burn are gone, plus smoother shifting from the transmission tune.^[2]

What Ez Lynk and EFI Live owners report

Same number twice. Treat it as a ballpark for your build, not a promise, because an owner average is exactly that: an average across a lot of different trucks.

The EFI Live Autocal V3 covers 2007 through 2021 Dodge Ram trucks. Owners report a 5 MPG increase on average, and the kit pays for itself in fuel savings before you even count the dealer trips you'll skip.^[5]

What RaceMe Ultra customers report

The RaceMe Ultra covers the same 2007 through 2021 Dodge Ram trucks. Notice it's a range, not a single number. Where your truck lands inside it depends on the rest of your build.

Reading the three figures side by side

Notice the wording on every one of them: owners report, customers report. These are owner numbers, not dyno sheets, and that's how you should read them.

Want a number you can bank on? Run your own baseline before the tune goes in, then compare after. Your truck, your gearing, your right foot — that's the only MPG figure that's truly yours.

Does the Tune Cover Your Transmission?

From the factory, the 2021 6.7L Cummins in a Ram 2500 or 3500 with the 68RFE automatic is rated at 370 hp and 850 lb-ft.^[6] Take the Auto Agent 3. On 68RFE trucks, the transmission tuning raises line pressure on every shift to protect the clutch packs.^[3] The 2022-2024 Cummins Delete Tuning Kit is next. 68RFE transmission tuning is included for automatic trucks; other transmissions get power tuning only.^[1]

Checking which transmission your truck has

Not sure what's bolted behind your Cummins? Find out before anything else, because it decides what the tune can do for the gearbox. The window sticker or the build sheet will tell you.

What 68RFE tuning does

Think of line pressure as grip strength. More power reaching the clutch packs is only good news if they can hold on to it.

That's why transmission tuning belongs in the conversation from day one. It shouldn't be an afterthought once the power levels climb.

Trucks that get power tuning only

Running a different gearbox behind your Cummins? Read that last line of the answer above again. Plan the rest of the build around it, so nothing surprises you on the dyno.

What Does Installing a 6.7 Cummins Tuner Involve?

Start with the EFI Live Autocal V3. The tune is built to order on a Windows 10 or 11 PC; allow 1–2 business days to build.^[5] Then there's the RaceMe Ultra. Many owners install it themselves in under 30 minutes through the OBDII port under the steering wheel.^[2] Last up is the Ez Lynk Auto Agent 3. It's a simple plug and play tune install.^[3]

Before the tuner arrives

Every one of these tunes is built around your truck, so the first job happens before anything ships. Have your VIN, model year and a list of what's already been changed on the truck in front of you. Get that right and install day is the easy part.

Plugging in at the OBDII port

The good news? This is the easy half. You're in the driver's seat, not flat on your back under the truck.

Route the cable so your knee can't catch it, and leave everything alone until the instructions say you're done. A calm install beats a rushed one every time.

The hardware that has to come off

A lot of guys assume the tune is the whole job. Here's the thing — the tune only changes what the ECM expects, and the hardware still has to come off. Running the EFI Live Autocal V3? You'll still need to install a DPF delete pipe after the tune.^[5]

Running the Ez Lynk Auto Agent 3 instead? You must physically remove the DPF, since leaving it in while the tune runs will clog it, and EGR delete is optional but highly recommended.^[3] Have the parts on the bench before you start, so you're not scrambling at the parts store mid-install. Work in the order your instructions give, and the job stays simple.

What Does the 2022-2024 Kit Include That a Tuner Alone Doesn't?

The 2022-2024 Cummins Delete Tuning Kit covers the 2022 through 2024 Dodge Ram. It's built around the RaceME Ultra delete tuner and ships with a brand-new MOPAR ECM, so you keep your original ECM as a stock fallback.^[1] Everything you need is in the box: the RaceME Ultra, all required cables, the MOPAR ECM, and instructions emailed after purchase.^[1] Processing runs 8-10 business days.^[1]

What ships in the 2022-2024 box

Here's the side-by-side worth doing. The standalone RaceMe Ultra covers 2007 through 2021 Dodge Ram trucks. Everything you need comes in the box: the RaceMe Ultra preloaded with VIN-specific delete tunes, the dash-mount display, all required cables and accessories, the 68RFE transmission tune, and a step-by-step guide.^[2]

Line the two lists up and one piece stands out: the new ECM. That single part is what changes how the install goes.

The new ECM and the stock fallback

You swap in the new MOPAR ECM, plug the tuner into your OBDII port under the steering wheel, and follow the included instructions.^[1] No sending your ECM out, no waiting for a flash.^[1]

Your factory ECM goes on the shelf untouched, a spare brain you can always go back to. That's peace of mind for the long haul.

How long the kit takes to ship

Built-to-order, not eligible for returns, but our team stands behind every tuner.^[1] So plan the build around the wait, not the other way round. Book your shop time once the box is in hand.

Do You Need the Tuner Harness Plug Kit Too?

The Tuner Harness Plug Kit for the 2013-2024 Ram 6.7 Cummins caps off the exposed OEM EGR and DPF (Diesel Particulate Filter) harness connectors left behind after your delete.^[7] It fits 2013-2024 6.7 Cummins models only, specifically Ram 2500 and 3500.^[7] One note: this kit does not include DEF (Diesel Exhaust Fluid) connector plugs.^[7]

What the caps cover

Each cap plugs directly into its OEM connector location, covering the EGR and DPF harness connectors and leaving a clean, finished look where your delete left open stubs.^[7] This kit provides the harness caps to keep water and debris out of the vehicle harness under the hood and under the body of the truck.^[7] Shipping is included in the price.^[7]

It's a small job that makes a deleted truck look finished. Your future self, crawling under it at the next event, will thank you.

Why open connectors cause trouble

After a delete, the wiring that ran your EGR valve, DPF pressure sensors, and related components is still there, just no longer connected to anything.^[7] Picture those open plugs sitting in mud and spray at every event. Corroded connectors throw intermittent fault codes that are miserable to chase down, and the corrosion can spread to adjacent wiring.^[7]

That's the gremlin nobody wants: a code that comes and goes, and shows up the morning you load the truck on the trailer. A set of caps keeps it away.

What the kit leaves out

If your application needs DEF plugs, contact us before ordering.^[7] It does not fit 5.9L Cummins or non-Cummins applications.^[7] Check the year range above before it goes on your build list, too.

Which 6.7 Cummins Tuner Should You Buy?

A 2022-2024 Ram pickup takes the 2022-2024 Cummins Delete Tuning Kit. For 2007.5-2021 trucks, the Ez Lynk Auto Agent 3 is the top pick. Its kit includes the switch for shifting power levels.^[3] The RaceMe Ultra suits pickup owners who want a dash-mount display. The EFI Live Autocal V3 suits owners who want a switch for less money. Its CSP4/5 switch for shifting power on the fly covers 2007.5–2018 models.^[5]

If your truck is a 2022-2024

For a 2022, 2023 or 2024 Ram 2500 or 3500 pickup with the Cummins 6.7L, the 2022-2024 Cummins Delete Tuning Kit is the pick. It's the only option in this guide for those years, so the real decision is timing, not which box. Get your order in early enough that the processing window doesn't eat into your season.

2007.5-2021: the top pick

For a 2007.5 through 2021 Ram with the Cummins 6.7L, the Ez Lynk Auto Agent 3 is our top pick of the older-truck tuners. Why that one?

Look back at the power ladder and the Cab & Chassis row in the fitment table, and the case makes itself. Five levels, a phone in your hand and a way back to factory settings if you ever need it — that's real bang for your buck.

If you want a screen on the dash

For a 2007 through 2021 Ram 2500 or 3500 pickup with the Cummins 6.7L, the RaceMe Ultra is the pick if you want a screen in front of you. Fits Ram 2500 and 3500 with the 6.7L Cummins across all pickup trims and box lengths; does not fit Cab & Chassis trucks — call (888) 830-2588 for those.^[2]

Preloaded, plugged in and readable at a glance between rounds, it's the easiest of the three to live with. If your truck is a pickup inside that window, you can't go far wrong.

If you want a switch for power levels

Some guys just want their hand on something physical. If that's you, read both box lists closely. The kit includes the Ez Lynk Auto Agent 3.0 with all required cables and accessories, delete tunes customized to your truck, the switch for shifting power levels, transmission tuning on 68RFE models, and step-by-step instructions emailed to you.^[3] Running a Cab & Chassis? Check that row of the fitment table first.

The EFI Live box is the other one. In the box: the EFI Live Autocal with all required cables and accessories (unlock cables for 2018+ models), a custom delete tune built to your truck, a CSP4/5 switch for shifting power on the fly on 2007.5–2018 models, transmission tuning for the 68RFE, and step-by-step instructions emailed to you.^[5] On the newer half of its range, look back at its power ladder before you decide. The cost table up top makes the rest of the case, so pick by your truck first, then by how you like to run it.