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RGMotorsport is a Randburg, Johannesburg-based tuner that has been tweaking standard cars with more performance for decades now.

Its latest modifications are applied to the Jeep Grand Cherokee SRT. Bolting a third-generation Whipple supercharger to the SUV’s 6.4l Hemi V8 engine has made it even more powerful than the factory-spec Grand Cherokee Trackhawk with its supercharged 6.2l Hemi that produces 522kW and 875Nm...

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