The 2016 single-cab boosted Denali giveaway truck is getting closer to its final form, and this episode from Boost District focused on the biggest step yet: installing a Magnuson 2650 supercharger. The team wasted no time tearing into the bay, pulling fans, hoses, and the belt drive apart to make room for the new setup.

One of the early highlights came from Trent’s wiring cleanup. The factory harness had already been patched together, and it wasn’t something anyone wanted to trust with boosted power. Instead of trying to make do, he built it right. Every connection was rewrapped and rerouted until the engine bay looked cleaner than what GM delivered from the factory. It’s the kind of detail that doesn’t add horsepower, but it does add peace of mind and a professional finish.

Solving The Fuel System Problem

Not everything went smoothly, though. The Denali was listed as having LT4 injectors, but once the blower install got underway, the team decided to pull them and double-check. It turned out they were LT1 injectors, which would never keep up with the airflow demands of a 2650. That discovery could have meant a big delay, but Boost District stocks LT4 injectors and matching harnesses in-house.

The fix went beyond just swapping parts. The original injector harness was a mess of butt connectors and worn wires. Instead of patching it, the crew dropped in a brand-new LT4 harness, which tied everything together neatly and made the bay more reliable. On the plus side, the high-pressure pump was indeed an LT4 unit, so half the fuel system was already correct. With new injectors, fresh wiring, and a pump ready to support the extra fuel flow, the Denali’s fueling was officially sorted.

Pulley Choices And Power Goals

With the blower bolted in, attention turned to the pulley setup. The Magnuson comes with a 105mm pulley that would keep boost down around 3–4 pounds. That would work, but it wouldn’t take advantage of the truck’s cam and lower compression ratio. Instead, the smaller 90mm pulley was chosen, which should raise the boost into the 7–8 pound range. The setup was finished off with an HD tensioner and revised belt routing to make sure the drive system stays solid.

Even with that pulley, the team left room for future adjustments. Boost District stocks plenty of different pulley sizes, so dialing in more boost later will be simple. For now, the 90mm is a smart starting point that balances power and reliability.

Wrapping It Up

By the end of the session, the boosted Denali was running with its new 2650 in place. The radiator hoses were trimmed and fitted, the sensors wired up, and the cooling system plumbed with a new heat exchanger. The first startup proved everything was working as it should.

The next chapter will bring dyno time and plenty of blower whine, but even now, the truck is taking shape as a serious street machine. With the wiring cleaned up, the fuel system corrected, and a supercharger bolted in, this boosted Denali giveaway build is officially past the halfway point.