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Revamp your Toyota GR Supra B58 with the HKS Super Turbo Muffler 31029‑AT004 — a high‑quality cat‑back exhaust engineered for better exhaust flow, a sportier sound, and everyday drivability.
Whether you’re after a more engaging exhaust tone, improved throttle response, or a performance upgrade that still respects everyday usability and legal requirements, this HKS exhaust delivers a well‑rounded package that fits right into the spirit of the Toyota GR Supra.
The Super Turbo Muffler 31029‑AT004 is crafted from premium SUS304L stainless steel for durability and corrosion resistance, giving you a long‑lasting performance upgrade without sacrificing reliability. Its dual 80–70mm center piping and 110mm dual exhaust tips deliver optimized flow and an aggressive exhaust note that’s louder and richer than stock without going overboard.
With a measured noise level of approximately 87dB (compared to stock 85dB), this muffler produces a deeper, engaging tone — perfect for spirited driving while still being manageable for daily commutes. The system is designed to work seamlessly with the factory exhaust valves, preserving your vehicle’s Normal/Sport mode switching.
This exhaust system is a direct‑fit cat‑back that connects right to the OEM mid‑pipe. It’s compatible with vehicles equipped with or without an OPF (gasoline particulate filter), making it versatile for different GR Supra configurations. Installation simply involves cutting the stock muffler at the mid‑pipe service point.
Unlike some performance exhausts, the 31029‑AT004 comes with EU certification, meaning it meets legal standards for street use in regions requiring approved systems — a big plus if you plan to drive your Supra daily or through inspection cycles.
Material: SUS304L stainless steel
Tip Diameter: 110mm (left & right)
Center Pipe: 80–70mm x 2
Noise Level: 87 dB (HKS) vs ~85 dB (stock)
Road Clearance: 125mm
Weight: 23.9kg
