Diesel Performance Shop in South Dakota
We work on all three: 5.9 and 6.7 Cummins, LB7 through L5P Duramax, 7.3 through 6.7 Powerstroke. Tuning starts with EFI Live, EZ Lynk, or HP Tuners depending on platform. From there it's intakes, exhaust, intercooler, turbo upgrades, fuel system, and built transmissions if you're chasing real power. Every build goes on the dyno before it goes home - we want to see the curve, not just hear a number. If your truck is a daily tow rig, we tune for low-EGT cruise and clean towing. If it's a sled puller, that's a different conversation entirely.
What's included
- /Custom tuning (EFI Live, EZ Lynk, HP Tuners)
- /Turbo upgrades and compound turbo builds
- /Intake, intercooler, and exhaust systems
- /CP3 conversions, lift pumps, injector upgrades
- /Built transmissions (Allison, 68RFE, 6R140) and torque converters
- /Dyno verification on every performance build
The 1776 process
- STEP 01
What's the goal?
Tow rig, daily, weekend warrior, sled puller. We tune to the use case.
- STEP 02
Baseline & inspect
Dyno baseline, scan tool, leakdown if needed. We see where the truck is before we touch it.
- STEP 03
Build the package
Parts ordered, install scheduled, tune written for your hardware.
- STEP 04
Dyno & deliver
Final dyno pull, EGTs verified, paperwork in hand.
What it costs
Tune-only from $1,500. Stage 2 packages ~$5,000–$8,000. Compound turbo + built trans builds $15K–$25K+.
Common questions
If your truck is under factory warranty, performance tuning can void powertrain coverage. We'll lay out the trade-offs honestly before you decide.
Stock bottom end: 550–600 RWHP on a good tune. Beyond that you need built rods or a built block. We tell you the wall before you hit it.
All three are great. It depends on use case and what you already own. We wrote a blog post on this - short answer: they're all winners if you build them right.
We follow federal and state law. We tune within compliance for street trucks.
A well-written tow tune usually improves mileage at cruise. A power tune driven hard will burn more fuel - that's physics.
Recent diesel performance builds
Project Midnight
Carli 3.25" Pintop suspension, full BD performance package, dyno-tuned to 650 RWHP on a tow-friendly EZ Lynk file.
Ghost Rider
BDS 6" lift, full skid armor, EZ Lynk tune, and a stealth gray paint job that disappears in the field at dusk.
Iron Horse
Frame-off restoration, LS3 swap with 4L80E, modern coilovers under classic sheet metal, full leather interior, original paint code respray.
Quote my diesel performance.
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