Genesis G70 (IK 2018+)

A proper ECU tune. The Lambda II twin-turbo responds very well on the stock turbos, and the eight-speed auto can be tuned alongside it for crisper shifts. After that, an intake and a catback or downpipes are the usual next steps.

A tune on 98 RON typically lifts a healthy 3.3T well past stock, with the bigger felt difference coming from torque and throttle response in the midrange. Downpipes plus a tune push it further again; the factory turbos are the ceiling before you go to a hybrid turbo upgrade.

Less than you'd think. Because the drivetrain is shared with the Kia Stinger, a lot of intakes, exhausts, intercoolers and turbo kits developed for the Stinger 3.3T bolt to the G70, so the aftermarket is far deeper than the Genesis badge alone would suggest.

The 3.3 has had turbocharger reliability cases (often the right-hand turbo) on higher-km cars, so it's worth checking before adding boost. The eight-speed auto is strong but benefits from a transmission tune and fresh fluid if you're chasing harder shifts and more power.