The K&N 57-6013 is a 57-Series Fuel Injection Performance Kit for the 3.5L V6 in the Nissan 350Z, which uses the VQ35DE, a DOHC 4-valve-per-cylinder design with VVT. It replaces the factory intake assembly, and the manufacturer's goal is to deliver more air with less restriction. The manufacturer's dyno work on a 2003 350Z recorded a 10.67 hp gain at 5500 RPM. Owners on user forums often describe intake gains on this car as only a few horsepower, so buyers should treat the figure as a realistic expectation rather than a guarantee. Compared with a basic drop-in filter, which owners on user forums generally expect to add very little, this kit is the more substantial airflow upgrade for a 350Z owner chasing a 350Z intake horsepower gain.
The manufacturer lists this kit for 2003 through 2006 Nissan 350Z models with the 3.5L V6. Its main engineering change is relocating the mass air sensor, which the manufacturer says allows the power gain while staying within the vehicle's operating parameters. That relocation means this is more involved than a simple filter swap, so plan for sensor and intake tube work. Searching for 350Z 3.5L cold air intake, VQ35DE intake kit, or 57-6013 MAF relocation will help you find owner discussions about installation, tuning, and results on the 2003–2006 cars.
The manufacturer lists the 57-6013 for the 2003, 2004, 2005, and 2006 Nissan 350Z with the 3.5L V6.
The manufacturer's dyno testing on a 2003 Nissan 350Z showed a 10.67 hp gain at 5500 RPM. Owners on user forums report smaller gains, often in the range of a few horsepower, and results depend on the car's setup and tune.
