Friday, September 24, 2021
News Hennessey Dynos A 2021 Chevrolet Tahoe High Country 

Hennessey Dynos A 2021 Chevrolet Tahoe High Country 

Hennessey’s a known pro at tuning GM products and would love it if the General would let them play


The idea was to see how much power it develops.

This Tahoe has a few modifications but they change little output-wise.


The 2021 Chevrolet Tahoe, and its twin, the GMC Yukon, are going to be big hits in their full-size SUV segment, as they’ve always been. In the past, Hennessey’s tuned these trucks up to a staggering 805-horsepower thanks to supercharging and other tricks.

Hennessey Tahoe HPE 800 | Photo: Hennessey

Unfortunately, as Hennessey says, GM’s locked the ECU limiting modifications to a simple cold-air intake and a cat-back exhaust system. In order to see if these changes had an impact on output, the put the Tahoe High Country on the dyno.

Hennessey published a video on YouTube showing that the ’21 Tahoe’s 6.2-litre L87 V8 puts out 369 horsepower and 397 lb.-ft. of torque at the wheels despite the add-ons. Spec-wise, the 6.2-litre is rated at 420 horsepower and 460 lb.-ft. of torque.

In the video’s description, Hennessey hopes that GM will see fit to work with the after-market industry for a future tuning solution. They even go so far as to say that, if consumers want to modify their SUV, they’ll have to buy something else.

The short video shares lovely noises, as stated by gmauthority.com, but the dyno results are somewhat disappointing.

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Matt St-Pierre
Trained as an Automotive Technician, Matt has two decades of automotive journalism under his belt. He’s done TV, radio, print and this thing called the internet. He’s an avid collector of many 4-wheeled things, all of them under 1,500 kg, holds a recently expired racing license and is a father of two. Life is beautiful. Send Matt an emai

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