Car: '08 Infiniti G37
Engine: VQ37VHR
PeakHP: 295.1
PeakTQ: 242.8
It doesn't take a genius to understand why different makes of the same performance part might have different effects on power when applied to the same engine; some parts are simply engineered and built better than others. But every once in a while, there comes an engine that seems to make no additional power, no matter which company's product you throw at it. Nissan's VQ-series engine is one. Nissan's engine management system in the 350Z and G35/37 so strictly monitors and adapts to changes in airflow, that few bolt-on performance parts unleash real any power on the cars, despite the incredible potential of VQ engines. When we tested Nissan's newest variant of the VQ in an '08 G37 a few months back, we actually found that the car lost power by installing an aftermarket intake kit. Regardless, Stillen's high-flow cats and cat-back exhaust were good for nearly 20 whp and lb-ft of torque on the car, and A'PEXi's grounding kit added the proverbial cherry on top, with a couple more ponies. Future modifications to the car freed over 30 more ponies with the re-addition of an intake kit and ROM tuning - underscoring the role ECU tuning and properly engineered performance parts will play in improving performance of newer cars into the future.
| BASELINE | 273.0 WHP | | 223.0 LB-FT | | |
| STILLEN DUAL EXHAUST SYSTEM | 278.5 WHP | +5.5 | 229.2 LB-FT | +6.2 | $1,340 |
| STILLEN HIGH-FLOW CATALYTIC CONVERTERS | 293.0 WHP | +14.5 | 242.3 LB-FT | +13.1 | $669 |
| A'PEXi SUPER GROUND STABILIZER | 295.1 WHP | +2.1 | 242.8 LB-FT | +0.5 | $239 |
| TOTAL | | +22.1 | | +19.8 | $2,248 |