The Genesis G70 3.3T has quickly become a favorite among performance enthusiasts who want a luxury sports sedan that doesn't break the bank. Under the hood lies a twin-turbocharged 3.3-liter V6 that already produces 365 horsepower and 376 lb-ft of torque from the factory. But the real potential of this engine is unlocked when you turn to trusted aftermarket brands like APR and VRSF. With the right combination of software and hardware upgrades, adding 50 or more horsepower is not only achievable but surprisingly straightforward. In this guide, we’ll walk through exactly how to get those gains, what each upgrade does, and what you can expect after installation.

Why the Genesis G70 3.3T Is a Tuning Favorite

The Lambda II twin-turbo V6 in the G70 is a proven platform, also found in the Stinger GT and other Hyundai Motor Group vehicles. Its closed-deck design, forged steel crankshaft, and robust cooling system make it highly receptive to increased boost and optimized fuel mapping. The stock turbochargers are capable of supporting power levels well beyond the factory calibration, which means even a simple ECU flash can deliver a noticeable jump in output. Enthusiasts have consistently reported gains of 40-60 horsepower at the wheels from a Stage 1 tune alone, and pairing that with upgraded hardware takes things even further.

APR Performance Tuning: The Software Foundation

APR (Audi Performance and Racing) has a long history of delivering refined, reliable ECU tunes for modern turbocharged engines. Their offerings for the Genesis G70 3.3T are no exception. APR provides multiple tuning stages, each designed to maximize power while staying within safe operating limits.

APR Stage 1 ECU Upgrade

The Stage 1 tune is the simplest and most cost-effective way to unlock significant horsepower. APR recalibrates the engine control unit to increase boost pressure, adjust ignition timing, and optimize air/fuel ratios. The result is a claimed gain of 55-60 horsepower and 70-80 lb-ft of torque at the crank, depending on fuel quality and ambient conditions. Throttle response sharpens, and the car pulls harder across the entire rev range. This tune requires no hardware modifications, making it ideal for daily drivers who want a stealthy performance upgrade.

APR offers versions for 93 octane, 91 octane, and even an aggressive 100 octane file for track use.

APR Stage 2 and Stage 3 Options

For those who want to push beyond Stage 1, APR offers Stage 2 tuning that benefits from a downpipe upgrade and freer-flowing exhaust. The Stage 2 calibration adds more boost and advanced timing, typically yielding an additional 10-15 horsepower over Stage 1. APR also provides a Stage 3 package for owners who invest in larger turbochargers and supporting fuel system modifications. However, for the scope of this article—adding 50+ horsepower with APR and VRSF—Stage 1 or Stage 2 with VRSF hardware is the most practical approach.

VRSF Hardware Upgrades: Letting the Engine Breathe

VRSF (VRSF Racing) specializes in high-quality, direct-fit hardware upgrades for the Genesis G70 and Stinger GT. Their intercooler and downpipe are two of the most effective bolt-ons to complement an APR tune. Without these hardware upgrades, the engine will quickly hit thermal or backpressure limits, reducing the effectiveness of the software tune.

VRSF Intercooler Upgrade

The factory intercooler on the G70 3.3T is prone to heat soak during aggressive driving. Once the intercooler temperature rises, intake air becomes less dense, and the ECU pulls timing to protect the engine, resulting in lost power. The VRSF intercooler uses a larger core, bar-and-plate construction, and optimized end tanks to keep intake air temperatures consistently lower. On a dyno, this can prevent the 10-20 horsepower drop that occurs when the stock intercooler heats up. During a hot summer pull or a track session, the improvement is even more pronounced.

The VRSF intercooler is a direct bolt-on upgrade that requires no cutting or modification to the vehicle.

VRSF Downpipe Replacement

The downpipe connects the turbocharger outlet to the exhaust system. On the G70, the stock downpipe incorporates restrictive catalytic converters that create backpressure and limit turbo spool speed. VRSF offers both catted and catless downpipes. The catless version removes the primary catalysts for maximum flow, while the catted version uses a high-flow metallic substrate to maintain emissions compliance in many regions. Either option reduces exhaust restriction, allowing the turbos to spool more quickly and reach higher boost levels.

When paired with an APR tune, a downpipe can add 15-25 horsepower to the wheels. Installation is fairly straightforward for a competent DIYer, though accessing the lower bolts can be tight.

Additional VRSF Components

VRSF also produces intake upgrades, charge pipes, and heat exchangers for the G70. While not strictly required to achieve 50+ horsepower, an aftermarket intake can reduce restriction and add a few more ponies. The charge pipe upgrade addresses the plastic factory charge pipes, which can crack under increased boost. For long-term reliability, these are worth considering.

Installation Walkthrough and Tips

Installing an APR tune and VRSF hardware can be done in a weekend with basic tools. Here’s a step-by-step overview to guide you.

Step 1: Obtain the APR Tune

Purchase the APR ECU upgrade from an authorized dealer or directly through APR’s website. You will receive either a handheld programmer or instructions to have your ECU flashed at a shop. Many owners choose to download the software and flash via OBD-II using a laptop and APR’s software tool. The flash process takes about 20 minutes.

Step 2: Install the VRSF Intercooler

Park the vehicle on level ground. Remove the front bumper cover (the G70 bumper comes off with a few bolts and clips). Locate the factory intercooler behind the bumper reinforcement. Disconnect the charge pipes and unbolt the stock intercooler. Fit the VRSF unit in place, reattach the charge pipes (use new silicone couplers if supplied), and reassemble the bumper.

The entire job takes 1-2 hours.

Step 3: Replace the Downpipe

Jack the car up on stands. Disconnect the oxygen sensors from the stock downpipe. Remove the bolts connecting the downpipe to the turbo outlet and the exhaust mid-pipe. Slide out the factory downpipe (this may require slight manipulation). Install the VRSF downpipe, using new gaskets if included.

Tighten all bolts to factory torque specs. Reconnect the O2 sensors. The catless version will require a spacer on the rear O2 sensor to prevent a check engine light, or you can have the APR tune disable the rear oxygen sensor monitoring. Expect about 2-3 hours for this step.

Step 4: Flash the APR Tune

With hardware installed, connect the APR programmer to the OBD-II port. Follow the on-screen prompts to flash the appropriate stage. For the combination of intercooler and downpipe, use the Stage 2 file if available, or use the Stage 1 file if you prefer a milder setup. The flash will reset adaptions, so expect a few driving cycles before the ECU fully optimizes.

Dyno Results and Real-World Gains

Real-world testing by Genesis owners has validated the claimed numbers. A stock G70 3.3T typically dynos at 300-310 horsepower at the wheels. After an APR Stage 1 tune with no hardware changes, wheel horsepower jumps to 355-365. Adding a VRSF intercooler and downpipe with a Stage 2 tune pushes wheel power to 380-395 horsepower. That’s a gain of 80-85 wheel horsepower, or roughly 95-105 crank horsepower.

Even on a conservative Stage 1 + intercooler setup, you’re looking at 50-60 crank horsepower over stock. The torque improvement is even more noticeable, with peak torque arriving earlier and holding longer.

These gains translate to real-world acceleration improvements. Quarter-mile times drop from the stock 12.9-second range to the 12.2–12.4-second range with a tune and downpipe. The 60-100 mph passing time shrinks by more than a second. The car simply feels alive, with relentless pull that keeps pushing you back into the seat.

Supporting Modifications for Reliability

When you increase power by 50% or more, supporting mods become important to maintain durability. The G70’s fuel system is capable of handling Stage 1 and Stage 2 power levels without issues. However, upgrading the spark plugs to one step colder (e.g., NGK) is recommended to prevent pre-ignition under high boost. Also, consider an oil catch can to reduce oil vapor buildup in the intake tract, which can cause carbon deposits on the valves. A transmission tune for the 8-speed automatic can improve shift firmness and reduce torque converter slip during hard acceleration.

Cooling system upgrades, such as a larger auxiliary radiator or upgraded heat exchanger for the intercooler system, can help maintain consistent performance during track days. But for street and occasional highway pulls, the VRSF intercooler and stock cooling are sufficient.

Reliability Considerations and Maintenance

APR and VRSF have established reputations for quality and reliability. Thousands of G70 and Stinger GT owners run these modifications daily. That said, pushing more boost and power does increase stress on engine components. Regular oil changes with a full synthetic 5W-30 are critical. Monitor boost pressure and intake temperatures using a scan tool or performance display.

If you live in a hot climate, consider upgrading to a higher-capacity auxiliary radiator. The factory turbos are robust, but they will eventually wear faster under increased load. Most owners find the trade-off worthwhile for the dramatic performance improvement.

Warranty concerns are often raised. APR’s tune is detectable by dealers if they scan the ECU, which may void the powertrain warranty. Some owners choose to remove the tune before service visits, though even then traces can be left. VRSF hardware is bolt-on and reversible, so you can return to stock if needed. Check with your local dealership’s policy before proceeding.

Conclusion

Adding 50+ horsepower to a Genesis G70 3.3T is realistic and achievable with a well-planned combination of APR tuning and VRSF hardware upgrades. The APR Stage 1 tune alone delivers a solid increase, while the addition of a VRSF intercooler and downpipe ensures that power is sustained and the car breathes freely. Installation is manageable for experienced DIYers, and the results are immediately gratifying. Whether you use the extra power for spirited back-road driving, track days, or simply enjoying a transformed daily commute, the G70 3.3T reward those who invest in these proven modifications. For more information and to purchase, visit the official APR website and VRSF website.

You can also find community discussions and dyno sheets on the Genesis Owners forum to see what other owners are achieving.