Product details
OVERVIEW
HKS makes two exhausts for the 3.0 GR Supra with two different goals. The Super Turbo Muffler is about power and comfort. The Dual Muffler is about sound: a separated dual layout with a straight-structure silencer, tuned to bring out the character of the B58 straight-six. It is the louder of the two, and its large dual titanium tips are shaped to fill the bumper cut-outs and show the HKS logo for a sportier rear view.
Piping steps up from the factory 80 mm to 85 mm before splitting into twin 70 mm pipes. Like the Super Turbo Muffler, it reuses the factory exhaust valve control and actuator, so the valve can still be switched from the cockpit — quiet when you want it, loud when you don't.
SPECS
- Type: Dual Muffler (DTi), separated dual layout
- Material: SUS304 stainless steel
- Tips: 120 mm titanium × 2
- Center pipe: 85 mm → 70 mm × 2 (stock 80 mm → 70 mm × 2)
- Proximity noise: 90 dB (stock 88 dB, sport mode)
- Idle noise: 66 dB (stock 58 dB, sport mode)
- Weight: 25.4 kg
- Uses the factory exhaust valve control and actuator
- For cars without OPF (gasoline particulate filter)
- Made in Japan
PARTS INCLUDED
- HKS Dual Muffler exhaust system with titanium tips
- Mounting hardware
- HKS installation manual
TECH RESOURCES
- Required extras: none. The factory exhaust valve actuator is transferred to the HKS system.
- Recommended: fresh exhaust flange gaskets and nuts, as the factory hardware is often damaged on removal.
- Installation manual (HKS): 31014-KT001 Dual Muffler installation manual (PDF)
- Installation notes: professional installation recommended. Support the car, remove the factory rear system, transfer the valve actuator and hang the HKS system on the OEM rubber mounts, aligning the tips in the bumper cut-outs before final torque.
- OPF cars: not compatible. If your car has an OPF, see the OPF-compatible HKS Super Turbo Muffler main muffler 31029-AT004.
- Fitment: HKS lists the DB42 GR Supra 3.0. Confirm fitment with us for later chassis codes before ordering.
- No CARB EO is published — off-road / competition use only in California.
- Price is for the item only; labor is not included.
PART NUMBER
- 31014-KT001 — HKS Dual Muffler, GR Supra 3.0 (DB42, B58), non-OPF
VEHICLE APPLICATIONS
| Make | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| Toyota | GR Supra 3.0 (non-OPF) | A90/A91 (DB42) | B58 3.0L Turbo I6 | 2020+ |