A car like the new Shelby GT350/GT350R lives and dies not just by how it looks and performs, but how it sounds and makes the driver feel. All the power in the world isn’t worth much without raw emotion behind it, and a huge part of that emotion comes straight from the tailpipes. That distinctive V8 growl can wake whole neighborhoods and bring a crowd of enthusiasts running over, and Ford’s engineers went to great lengths to ensure that all new Mustang models had that sporty sound.

There’s no denying that the GT350 sounds like an absolute beast straight from the factory, but there are certain things Ford can’t legally do on a production car. That’s where aftermarket companies like Kooks come into play, offering customers a chance to step away from the limits of legality and letting the 5.2-liter Voodoo V8 reach its maximum potential.

The exhaust note of a Mustang is so important to its identity that Ford included a dual mode exhaust system for the Shelby GT350; a tame “normal” mode and a loud-and-proud “sport” mode that lets the raspy Voodoo V8 sing to its hearts content. You can hear both modes from a production GT350 screaming in the video above, though it’s nothing compared to what the Kooks long tube headers do.

Just a few decibels short of open pipes, this GT350 with Kooks long tubes blasts down the road sounding every bit like a track-only race car. The only other modification is an off-road X-pipe exhaust setup, meaning that technically this is a track-only car. Pesky things like noise ordinances and emissions standards mean that automakers can’t sell you a car this mean-sounding, but that gives companies like Kooks a chance to fill in that gap and bring out every horsepower hiding in that Voodoo V8.