What We Offer
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The Most Popular
FEATURED PRODUCTS
OVERKILL CUSTOM
TUNING
EFILive & HP Tuner RTD Platforms
Custom calibration files built in-house for maximum power, reliability & drivability. Tailored to your specific truck, mods, and goals — whether you're towing 20,000 lbs or chasing 3-second 0-60s.
CUSTOM TUNES
Tailored to your exact mods, altitude, and driving style. No cookie-cutter maps.
MULTI-LEVEL
Switch between tow, daily, performance, and competition maps on the fly.
REMOTE SUPPORT
Revisions and adjustments included. We're with you until it's perfect.
BUILT. TUNED. PROVEN.
Customer trucks put down real numbers — not dyno-queen promises.
500+
HP Gains
Why Overkill
BUILT DIFFERENT
QUALITY GUARANTEED
Every part we sell is hand-selected and tested. No cheap knockoffs, no compromises. We only carry brands we'd put on our own trucks.
FAST SHIPPING
Free shipping on orders over $150 — exhaust systems ship at a $100 flat rate. Fast processing and tracking on every order.
EXPERT SUPPORT
Real diesel guys answering your questions. Not a call center — actual enthusiasts who've built trucks and know your platform inside and out.
CUSTOM TUNING
Overkill Custom Tuning built in-house for your exact truck, mods, and goals — not generic canned files pulled off a shelf.
Real Builds. Real Power.
THE BUILDS
Customer Stories
WHAT THEY SAY
“Absolutely transformed my Cummins. The tuning alone added 150hp and the truck drives better than stock. These guys know diesel.”
“Best turbo upgrade I've ever installed. Overkill doesn't cut corners — quality parts and they actually answer your questions before you buy.”
“Had them build my transmission after I smoked the stock one towing. 30,000 miles later and it shifts like butter. Worth every penny.”
“Finally found a shop that knows what they're doing with Duramax. The exhaust setup they recommended sounds incredible and added 40hp.”
“Ordered a full fuel system upgrade for my 7.3 Powerstroke. Parts shipped fast, fitment was perfect, and their install guide saved me hours.”
“These guys are the real deal. Not just another dropshipping parts store. They know what works and what doesn't, and they're always straight with you.”
Follow the Build
@OVERKILLDIESELPERFORMANCE
Let's Build Something
READY TO BUILD?
Whether you're adding 100hp or 500hp, we have the parts and the knowledge to get you there.