The Ram 2500 equipped with the 6.7-liter Cummins turbo diesel is already a formidable workhorse, but many owners find that a carefully chosen performance tuner can unlock capabilities the truck simply doesn’t show from the factory. Among aftermarket programmers, the Edge Evolution CTS2 stands out for its combination of user-friendly tuning, real-time monitoring, and reliability. When properly configured, the CTS2 can deliver a genuine 50-horsepower increase while still preserving safe EGTs and transmission health. This article covers exactly how those gains are achieved, what the tuning process looks like, and how to get the most out of your Ram 2500 diesel with the CTS2.

Overview of the Edge Evolution CTS2

The Edge Evolution CTS2 is a multi-function programmer and monitor built for late-model diesel trucks. Unlike some competitors that require a laptop or phone app for every change, the CTS2 features a full-color touchscreen display that attaches to your windshield or dash. Through that screen you can select tuning levels, view custom gauges, read and clear diagnostic trouble codes, and log performance data. The unit connects to the OBD-II port and also includes an optional external sensor kit (typically an EGT probe) that provides critical exhaust temperature data.

  • Real-time data monitoring – Boost, EGT, transmission temp, RPM, and dozens of other PIDs can be displayed on configurable gauges.
  • Pre-loaded tune files – Multiple tuning levels are pre-installed: Economy, Towing, Performance, and Extreme (where available).
  • Custom tuning capability – The CTS2 can accept custom tunes from reputable tuners, allowing for further optimization based on modifications.
  • Onboard diagnostics – Read and clear trouble codes, view freeze frame data, and run enhanced diagnostics.
  • Datalogging – Capture runs and real-world driving data for analysis or sharing with a tuner.

Diesel Engine Specifics – The 6.7L Cummins

The Ram 2500 diesel is powered by the Cummins 6.7L ISB inline-six, a robust engine known for its torque and durability. Factory output is around 370 hp and 850–900 lb-ft (depending on model year). The Cummins uses a common-rail fuel injection system with variable geometry turbocharging, which is highly responsive to tuning.

Tuning with the CTS2 works by modifying several key parameters:

  • Fuel injection timing and quantity – More fuel at the right moment increases cylinder pressure and power.
  • Boost pressure targets – The tuner can command higher turbo boost, but only if the turbo and wastegate can safely deliver it.
  • Injection pressure – Increasing rail pressure improves atomization and burn efficiency.
  • Torque management – Reducing torque limiting in lower gears yields a noticeably stronger throttle response.

Because the 6.7L has a strong bottom end and ample cooling capacity, a 50 hp gain is well within safe limits when paired with proper EGT monitoring and good fuel.

Achieving 50 Horsepower Gains – Real World Results

The claim of “50 additional horsepower” is not marketing hype when using the CTS2’s Performance or Extreme tune on a stock Ram 2500. Dyno tests have shown gains of 40–60 hp and 100–150 lb-ft of torque at the wheels, depending on the specific year and fueling strategy. The actual figure depends on factors such as:

  • Fuel quality – Lower cetane or high water content can reduce gains and cause excessive smoke.
  • Air intake and exhaust restrictions – A free-flowing intake and a less restrictive exhaust system will allow the tuned engine to breathe better and make more power.
  • Ambient conditions – Cool, dense air supports more boost and fuel without crossing safe EGT limits.
  • Vehicle year and calibration – Later models with stricter emissions hardware may have slightly lower gains unless that hardware is modified (see emissions notes below).

To achieve a consistent 50 hp gain, most owners pair the CTS2 with at least a high-flow air filter or cold air intake. An aftermarket 4-inch exhaust further reduces backpressure and EGTs, allowing the tuner to add more fuel safely. On a bone-stock truck, the Economy tune alone may give 20–30 hp, while the Performance tune delivers the full 50+ hp.

Installation Process – Step by Step

Installing the Edge Evolution CTS2 is a straightforward DIY job that takes about 30 minutes. No special tools are needed beyond a trim removal tool or plastic pry bar for routing cables.

  1. Locate the OBD-II port – On Ram 2500 trucks, it’s under the dashboard to the left of the steering column.
  2. Connect the CTS2 main cable – Plug the OBD-II connector into the port. Ensure the cable is routed away from pedals and heat sources.
  3. Mount the display – Use the supplied suction cup mount on the windshield or an adhesive dash mount. Some owners prefer a pod mount on the A-pillar for a cleaner look.
  4. Connect power and optional EGT probe – If using the EGT probe, it must be installed in the exhaust manifold or downpipe. The probe cable runs into the cab through a rubber grommet. Power for the EGT circuit is provided by the OBD connection.
  5. Turn the ignition on – The CTS2 will power up and guide you through initial setup: language, units, and vehicle selection.
  6. Flash the first tune – Choose your desired tuning level and follow the on-screen prompts. The truck must remain in “ignition on” during the flash, which takes 3–5 minutes. Do not disconnect or touch the cable during the flash.
  7. Verify monitoring – After flashing, start the engine and verify that gauges read correctly (boost, EGT, trans temp). Calibrate any sensor offsets if needed.

Edge Products provides clear instructions, and many forums have detailed write-ups with photos for the EGT probe installation. If you are not comfortable drilling into your exhaust, many diesel shops can install the probe for a small fee.

Tuning Modes Explained

The CTS2 comes with multiple pre-loaded tunes, each optimized for a different use case. Understanding these helps you maximize the 50 hp gain while protecting your truck.

Economy Tune

This tune adjusts fuel delivery to improve mileage by 1–3 MPG under normal driving conditions. Horsepower gain is modest (20–30 hp) but torque delivery feels smoother. Best for daily commuting and highway cruising.

Towing Tune

Designed for hauling heavy loads, this tune increases low-end torque and reduces transmission slip. Horsepower is not the priority; instead, the goal is to maintain safe EGTs under sustained load. Gains are around 30–40 hp, but torque can exceed 1000 lb-ft at low RPM.

Performance Tune

This is where the 50 hp increase is realized. The Performance tune advances timing, raises boost targets, and enriches the fuel curve for maximum power. It’s intended for unloaded driving and occasional spirited use. EGTs typically stay below 1300°F when towing is not involved, but constant full-throttle runs can exceed safe limits without an EGT gauge.

Extreme Tune (if available)

On some model years, Edge offers an Extreme tune that pushes power even further—potentially 70–80 hp. This usually requires supporting mods such as a lift pump, upgraded intercooler, or larger turbo. For a stock truck, Extreme tune is not recommended without external monitoring and a conservative right foot.

Custom Tuning

If you have modified your fuel system, turbo, or removed emissions equipment, a custom tune written by a professional diesel tuner can be loaded onto the CTS2 via a Windows computer. This allows precise calibration for big injectors, compounds, or nitrous. The CTS2’s memory can store one custom tune alongside the four pre‑loaded options.

Real-Time Monitoring – Your Engine’s Dashboard

One of the strongest advantages of the CTS2 is its monitoring capability. After programming, the screen shows up to six customisable gauges. Critical parameters to watch:

  • Exhaust Gas Temperature (EGT) – Keep pre-turbine EGTs below 1300°F for sustained driving, or below 1500°F for very short bursts. Sustained high EGTs can damage the turbo and pistons.
  • Boost Pressure – Stock Cummins boost peaks around 30–35 psi. With the Performance tune you may see 38–42 psi, which is safe for a stock turbo but should be monitored.
  • Transmission Temperature – The Ram’s 6-speed automatic (68RFE or Aisin) can overheat under high torque. Keep trans temp below 230°F; if it exceeds 250°F, back off immediately.
  • Throttle Position and Fuel Rail Pressure – These help diagnose fuel system issues and confirm the tune is commanding the correct pressure.

The CTS2 can also set visual and audible alarms for user-defined thresholds. For example, you can set an alarm at 1350°F EGT to prevent accidental meltdown.

Additional Performance Upgrades to Complement Tuning

While the CTS2 alone delivers the advertised 50 hp gain, pairing it with simple bolt-on modifications can improve reliability and allow even greater performance down the road.

  • Cold Air Intake – Reduces restriction and improves filtration. Gains 5–10 hp on a tuned truck and lowers IATs for denser air.
  • Turbo-back exhaust system – A 4-inch downpipe and exhaust reduces backpressure, lowering EGTs by 50–100°F. This safety margin lets you run the Performance tune with more confidence.
  • Lift Pump / Fuel system upgrade – The stock lift pump can become a weak point with higher injection pressures. An aftermarket lift pump ensures consistent fuel volume.
  • EGT probe and pyrometer – Essential if you plan to use the Extreme tune or tow with a performance tune. Allows the CTS2 to display accurate exhaust temperatures.
  • Transmission tuning or upgrade – The 68RFE automatic can benefit from a billet torque converter and valve body to handle the increased torque. If you keep to the Towing or Performance tune, a stacked transmission tuner may be enough.

Fuel Economy and Maintenance Considerations

Many owners are pleasantly surprised that the Economy tune improves fuel efficiency by 1–3 MPG when driven normally. The tuning reduces unnecessary fueling during light throttle and alters shift points to keep the engine in a more efficient RPM range. However, heavy use of the Performance tune will hurt fuel economy, often dropping it by 2–4 MPG under aggressive driving.

Maintenance should not be neglected after tuning. Shorter oil change intervals (5,000–7,500 miles) are prudent because higher cylinder pressures increase soot and fuel dilution. Fuel filters should be replaced every 10,000–15,000 miles with high-quality filters. Keep a close eye on coolant levels and trans fluid condition.

Potential Drawbacks and Considerations

While the Edge Evolution CTS2 is a safe, proven product, there are a few factors to keep in mind before installing one on your Ram 2500.

  • Emissions compliance – The CTS2 tunes will disable or modify certain emissions functions, including DPF regeneration timing and EGR operation in some cases. This may violate federal or state emissions laws, especially in California. Check your local regulations before flashing.
  • Warranty impact – The powertrain warranty on a new Ram 2500 can be voided if the ECM is reprogrammed. Some dealerships will flag the ECM flash counter. Edge’s “Evolution” series does allow returning to stock, but dealers can still detect that a tune was applied.
  • EGT monitoring necessity – Running the Performance tune without an EGT gauge is a risk. All modern tuners should be paired with a pyrometer. Edge offers a probe kit, but you must install it.
  • Turbo longevity – Higher boost and heat can shorten turbocharger life, especially if the truck is driven hard frequently. Keeping an eye on boost spikes and allowing cool-down idling helps.

Final Thoughts – Is the CTS2 Worth It for 50 HP?

For the Ram 2500 diesel owner who wants a noticeable power increase without going deep into engine modifications, the Edge Evolution CTS2 delivers exactly what it promises. The 50 hp gain is real, the monitoring features add peace of mind, and the ease of installation makes it accessible even for DIYers. Whether you use it for towing, hauling, or just daily commuting, the CTS2 transforms the driving experience while maintaining a level of safety and reliability that hard parts alone cannot match.

If you already have a CTS2 or are planning to buy one, investing the extra time to install the EGT probe and a simple intake/exhaust combo will ensure you get the most out of the Performance tune. For those who want to retain factory reliability, the Economy or Towing tune offers significant power improvements with minimal risk. The Edge Evolution CTS2 remains one of the best all-in-one solutions for the 6.7L Cummins, providing the horsepower gains you want and the data you need to keep your engine healthy.

For further reading on the CTS2, visit Edge Products’ official page. To explore more about Cummins diesel tuning, Cummins’ technical overview is a great resource. For owner experiences, check the Cummins Forum or Diesel Power Products for supporting parts.