Kooks Headers and Exhaust just released the dynamometer results for their new system for Chevrolet Silverado trucks, model year 2014 and up. If you’re looking to add some “vroom” to your Chevy hauler, this looks like a great way to go.
Power and torque gains are sizable in the low engine-speed range, peaking at about 3,000 RPM with an increase of around 15 horsepower, and 25 foot-pounds. The real fun begins to happen after about a quarter-thousand beyond that, when the results from Kooks’ dyno runs shows an astonishing gap between the stock and modified exhaust systems.
At it’s best, Kook is claiming an advantage of around 36 to both horsepower and torque, using the stock 5.3 liter mill on regular gas! The only non-OE components are Kook’s exhaust headers, catalytic converters, and cat-back system. That’s enough to bring your otherwise-stock Silverado up to 324 horsepower, and a potent 349 ft-lbs.
Better still, this is accomplished with EPA-certified “green” catalytic converters; the company also has available less eco-conscious cats, as well as a straight-pipe “offroad” version available.
You can watch the video of one of Kooks’ dyno runs (and take in the vicious V8 grunt) below: