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HKS Hi Power Exhaust Application: Mazda 3 (5 Door Only) Part Number: 32003-BZ001 Notes: For Off Road Use Only Tip Diameter: 96mm Piping Diameter: 65mm Hi-Power Exhaust Inspired and designed from endurance and GT racing in Japan, HKS developed its Hi-Power Exhaust system for both turbocharged and naturally aspirated 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.