Korsh Unequal Length Headers: Subaru BRZ/Toyota 86 12-21Korsh's unequal length headers for the BRZ and 86 platform optimize exhaust flow dynamics through precisely calculated runner lengths. This design minimizes overlap losses and maximizes scavenging efficiency, resulting in tangible gains in mid range torque and peak horsepower. The staggered tube configuration also produces a distinctive, purposeful exhaust character that complements the performance upgrade. Constructed from quality materials to handle