Edge's CTS4 Is the First All-New Insight Hardware Since 2020, With a Bigger, Faster Screen

The Edge Insight has been a fixture on diesel dashboards for years, and the CTS3 has been the current one since 2020. Its replacement is here. Holley, which owns Edge, called the CTS4 its newly launched next generation of in-cab monitoring ahead of SEMA, and Diesel Army published a detailed look at the hardware and its versions on November 3.

The hardware jump is significant. A dual-core 1.7 GHz processor gives what Edge claims is 3.4 times the CTS3's processing power, and memory goes from 512 MB to 2 GB. The screen grows from 5.0 to 5.5 inches at 1280 by 720, about 21 percent more viewing area, with a 60 frames per second refresh. A cold boot takes under 12 seconds, compared with more than 40 on the CTS3, according to Diesel Army.

Four versions

The Insight CTS4 is monitor-only. It fits 1996-and-newer OBD-II vehicles, does not change the calibration and can be upgraded online later. The Insight+ CTS4 adds PowerCal custom-tuning capability with a VIN-specific license, with tunes bought from Edge tuning partners. The Evolution CTS4 carries preloaded tuning, with Edge quoting gains of up to 175 hp and 470 lb-ft on select diesel applications. The Juice with Attitude CTS4 pairs the screen with Edge's Juice inline module for on-the-fly power levels on 2003 to 2018 Ram Cummins trucks, priced at $1,449.95 for most applications.

Edge's tuning products do not allow removal or disabling of EGR or DPF equipment, Diesel Army notes, and the Evolution and Insight+ carry a California warning with CARB testing listed as pending.

Why it matters

Two USB-C ports, a direct RCA camera input, Wi-Fi updates and programmable rear buttons bring the Insight up to date with what truck owners expect from a screen in 2026. For the towing and lifted crowd, the real value is still the gauges and logging, with 31 layouts, peak recall, data logs up to 30 minutes and drag-style timers, on a screen fast enough to read at a glance.