N1 Cat-Back Exhaust System

The APEXi N1 Exhaust System is a high-performance cat-back exhaust specifically engineered for the 2002-2007 Subaru WRX and STI models (chassis codes GDA/GDB). Drawing from APEXi's extensive experience in demanding racing environments, including the N1 endurance series, this exhaust system is designed to optimize exhaust flow and deliver a more aggressive auditory experience. Constructed with performance in mind, the N1 exhaust features a pipe diameter ranging from 70-80mm, culminating in a substantial 115mm tip diameter. This configuration is intended to reduce back pressure and improve exhaust scavenging, potentially leading to enhanced engine response and power output. The straight-through muffler design minimizes restrictions for maximum flow efficiency. While the direct benefits of exhaust upgrades can vary, cat-back systems like the APEXi N1 are generally associated with improved exhaust tone and a noticeable increase in horsepower and torque when paired with other performance modifications. For optimal performance and reliability, it is always recommended to consult with a professional installer or refer to specific tuning guides for your vehicle. This APEXi N1 Exhaust System is designed for the 2002-2007 Subaru WRX and STI.