Lambert Performance Labs started the way most good things do — with a stubborn idea and a car that wouldn’t leave us alone.

That car? A 1980 Cadillac Coupe DeVille. Big, heavy, unapologetically American — and absolutely unfit for the kind of diesel power we had in mind. But we made it work.

That first swap wasn’t about chasing trends or turning heads. It was about building something right — clean wiring, seamless integration, and a finished product that looked like it came off the GM line, not out of a junkyard. And that mindset never left.

Based in Upstate New York, we engineer and build control system wiring harnesses and complete swap kits for GM Duramax platforms, with the only full-system solution on the market for the LM2 Duramax. Our focus is on clean engine bays, reliable electronics, and systems that elevate the overall quality of your build — no messy patches, no Frankenstein wiring, no BS.

Our products are tested in real-world conditions — not just on paper — and we stand behind every pin, connector, and circuit. Because when you're chasing horsepower, reliability, and clean install aesthetics, half-measures don’t cut it.

We build every kit like it’s going into our car. Because it started with ours.

All Lambert Performance Labs Products are proudly engineered and manufactured in Upstate NY. By keeping production within the U.S. we ensure tight quality control , fast lead times, and stable pricing - unaffected by offshore tariffs or international supply chain disruptions.