HKS HiPower SPECL2 ZD8 Cat Back Exhaust - 2022-2023 Subaru Limited | 32016-AF101

Hi-Power SPEC-L2 Cat-Back Exhaust for the 2022-2023 Subaru BRZ

The HKS Hi-Power SPEC-L2 Cat-Back Exhaust for the 2022-2023 Subaru BRZ (ZD8) is the BRZ-specific application of HKS's flagship cat-back exhaust for the FA24 platform. The SPEC-L2 designation represents the second generation of HKS's Hi-Power SPEC-L tuning. Revised internal geometry for improved mid-range response and a refined sound character that is more present and defined than the SPEC-L while remaining appropriate for the street.

Specs & Highlights

• Cat-back exhaust system
• SPEC-L2 muffler tuning for FA24
• BRZ ZD8 specific fitment
• Single exit configuration
• Stainless steel construction
• Fitment: 2022-2023 Subaru BRZ (ZD8)

60.5mm Pipe, 93 dB(A), BRZ ZD8-Specific Routing

The AF101 SPEC-L2 for the ZD8 BRZ uses a 60.5mm main pipe and 115mm single tip, the same pipe diameter as the BT004 SPEC-L, but with SPEC-L2 internal tuning for a higher-definition mid-range pulse. Sound level is approximately 93 dB(A) at 1m at WOT, approximately 2 dB higher than the SPEC-L. The BRZ-specific routing compensates for the ZD8 underbody geometry differences at the rear axle versus the GR86, ensuring proper hanger alignment and ground clearance throughout the exhaust path.

SPEC-L vs SPEC-L2 for the BRZ Platform

The ZD8 BRZ designation is Subaru's internal chassis code for the second-generation BRZ. HKS uses this code to differentiate the BRZ-specific exhaust fitment from the GR86 equivalent, as the two platforms have slightly different exhaust routing geometry under the car despite sharing the same FA24 engine.

ZD8 Underbody Geometry and Routing Differences

The SPEC-L2 for the BRZ produces a sound character that works with the FA24's boxer four cylinder note. A more refined, fuller sound than the factory exhaust without the shrill quality that some aftermarket exhausts add to a four-cylinder application. The BRZ's character is enhanced rather than overwhelmed.

The FT Breakdown

For 2022-2023 BRZ owners wanting the HKS exhaust upgrade, confirm whether you want the SPEC-L (BT004) or the SPEC-L2 (AF101) based on sound preference. The L2 is the higher-specification, more performance-oriented version. The L is the more refined, subdued option. The ZD8 underbody routing difference between the BRZ and GR86 is subtle from outside the car but significant for exhaust fitment — the BRZ rear subframe geometry positions the hanger locations and heat shielding differently than the GR86. Using the GR86 exhaust on a BRZ typically results in misaligned hangers and ground clearance issues that become apparent immediately on installation. The AF101's BRZ-specific routing avoids that.