About Larssen's Diesel Performance
Built by diesel enthusiasts, for diesel enthusiasts — from work trucks to semis.
Truck Performance
Turbos, tuners, exhaust, fuel systems, and more for Ford Power Stroke, Dodge Cummins, and GM Duramax.
Ag & Construction
Custom tuning and performance parts for John Deere, Case, New Holland, Bobcat, Kubota, and Caterpillar equipment.
Semis & Heavy Duty
ECM tuning and upgrades for Cummins, Paccar, Detroit, Volvo, and Mack powered semis — power and fuel economy.
Our Story
Larssen's Diesel Performance started with a simple belief: diesel owners deserve parts and tuning that actually deliver — real horsepower gains, better fuel economy, and reliability that holds up under hard work. What began as a passion for building and tuning diesel trucks has grown into a full-service performance shop.
We don't just sell parts — we run them, dyno them, and stand behind them. Every product we carry is tested by people who wrench on the same engines you do. Whether it's a 6.7 Cummins pulling a fifth wheel, a John Deere running long harvest hours, or a semi logging highway miles, we know what it takes to keep it running strong and making power.
Beyond parts, we offer custom ECM tuning — send us your factory file, and we'll build a tune for your exact setup. And if you're a shop looking to resell, our dealer program gets you real pricing on the same products we run ourselves.
Why Shop With Us
- • Tested, proven products — no gimmicks
- • Custom ECM tuning for your exact setup
- • Dealer pricing for qualified shops
- • Expert advice from real diesel builders
Get In Touch
Questions about a build, a tune, or dealer pricing? We answer fast.