The four-cylinder turbo version of Hyundai’s first foray into rear-wheel-drive sports cars - the 2009 Hyundai Genesis Coupe -  was always going to be favourite among enthusiasts and tuning houses.

Now, having had some time to investigate the inline-four Theta engine’s capabilities, tuners are starting to unleash its full potential.

American tuning outfit Beyond Redline has had its way with the Theta donk, strapping on a bigger Garrett GT30 turbo, throwing in 600cc injectors and installing an AEM Fuel/Ignition Controller.

Running 16psi (just over 1bar) of boost, Beyond Redline managed 228kW (306hp) and 332Nm (245lb-ft) of torque on a Dynojet setup, with a later attempt delivering 256kW (344hp) at the rears.

For your reference, the Genesis Coupe’s standard output with the four-cylinder turbo is around 160kW (210hp) and 302Nm (223lb-ft) at the flywheel.

Beyond Redline said it is working on advanced stages of the kit – as well as finalising the setup that achieved the above figures – and that 300kW (400hp) is next on the list of number and letter combos to match up with some squiggly lines.