HKS Hi-Power Exhaust - 2002-2007 WRX, 2004-2007 STI

Inspired and designed from endurance and GT racing in Japan, HKS developed its Hi-Power Exhaust system for turbocharged applications. HKS has incorporated this new race inspired offset muffler and piping design into many street applications, which offers a greater flow and higher-PRM power gains due to the less restrictive design. This is achieved by eliminating unnecessary bends for the straightest exhaust path. 

Does not clear on vehicles with optional Subaru skid-plate (rear differential).