HKS Hi-Power Muffler SPEC-L Exhaust System - 2022-2024 Subaru BRZ / Toyota GR86

Hi-Power Muffler SPEC-L Cat-Back Exhaust for the 2022+ BRZ and GR86

The HKS Hi-Power Muffler SPEC-L Cat-Back Exhaust for the 2022-2024 Subaru BRZ and Toyota GR86 brings HKS's single-exit Hi-Power character to the FA24-powered second generation platform. The SPEC-L internal tuning is calibrated for the FA24's displacement and power delivery, producing an exhaust note with more presence and resonance than the SPEC-L2 while remaining livable for regular street driving.

Specs & Highlights

• Cat-back exhaust system
• SPEC-L internal muffler tuning
• Single exit configuration
• Calibrated for FA24 engine
• Stainless steel construction
• Fitment: 2022-2024 Subaru BRZ / Toyota GR86

60.5mm Pipe, 8.5 kg, 91 dB(A) at WOT

The BT004 SPEC-L for the 2022+ platform uses a 60.5mm (2.375 inch) main pipe diameter, slightly larger than the SPEC-L2 (AT123) at 50.8mm, reflecting the FA24's higher exhaust volume versus the FA20. Exit tip diameter is 115mm (4.5 inch). System weight is approximately 8.5 kg. Sound level is approximately 91 dB(A) at 1m at WOT, similar to the FA20 SPEC-L2. The SPEC-L internal geometry for the FA24 application uses HKS's chamber-and-baffle design rather than a straight-through design, which is responsible for the refined daily-driving character.

Chamber-and-Baffle Design for the FA24

The FA24 in the 2022+ GR86 and BRZ produces more torque and a different exhaust pulse character than the FA20 in the previous generation. The SPEC-L tuning for this application accounts for that difference. It is not a repackaged FA20 exhaust. The result is an exhaust that works with the FA24's power delivery and makes the most of the engine's improved low-end response.

SPEC-L vs SPEC-L2 for the 2022+ Platform

Single exit configuration with HKS's characteristic tip finish. The SPEC-L is the more understated sound option in the HKS lineup for this platform. Louder than stock, present under load, not fatiguing at highway cruise. For the 2022+ chassis, verify the SPEC-L (BT004) versus the SPEC-L2 (BT002 or AF101) based on your sound level and tuning preferences.

The FT Breakdown

The Hi-Power SPEC-L is for BRZ and GR86 owners who want the HKS exhaust upgrade without the higher decibel level of the SPEC-L2 or the multi-exit visual statement of the Legamax. It is the measured, refined choice in the HKS lineup for the second generation platform. The chamber-and-baffle muffler internals are what differentiate the SPEC-L sound from the SPEC-L2 on the 2022+ platform. Both use 60.5mm pipe; the difference is entirely in the muffler body's internal architecture. If the 91 dB(A) SPEC-L is the right volume for your daily use, the engineering quality is the same as the louder variant — HKS does not cut corners on the quieter products.