HKS Legamax Axle Back Exhaust - 2013-2016 FR-S / BRZ

Legamax Axle-Back Exhaust for the 2013-2016 FR-S and BRZ

The HKS Legamax Axle-Back Exhaust for the 2013-2016 Scion FR-S and Subaru BRZ is a muffler-only replacement that retains the factory cat and front pipe while replacing only the rear muffler section. The axle-back scope means the installation is straightforward and accessible. The factory flanges at the axle are unbolted and the HKS Legamax muffler replaces the OEM unit. The Legamax sound character is deep and refined rather than aggressive.

Specs & Highlights

• Axle-back exhaust, muffler replacement only
• Retains factory cat and front pipe
• Legamax muffler design, deep, refined sound
• Simple installation using OEM flange connections
• Stainless steel construction
• Fitment: 2013-2016 Scion FR-S / Subaru BRZ

50.8mm Inlet, 110mm Tip, 87-88 dB(A), 5.2 kg

The axle-back Legamax uses a 50.8mm inlet pipe matching the factory mid-pipe diameter and a single 110mm tip. Sound level at WOT is approximately 87–88 dB(A) at 1m, roughly 3 dB over stock and the quietest HKS exhaust option for the early FA20 platform. The muffler body is 135mm diameter and 300mm in length, fitting within the factory hanger and heat shield clearances without modification. System weight is approximately 5.2 kg versus the OEM rear muffler section at approximately 6.8 kg.

Axle-Back Scope and Legamax Sound Character

The axle-back is the entry point to the exhaust upgrade path. It is the least invasive change. You keep the factory mid-section and just replace the muffler. For FA20 owners who want an exhaust sound improvement without the full cat-back investment, the Legamax axle-back delivers meaningful character change at lower cost.

Entry Point to HKS Exhaust on Early FR-S and BRZ

Fitment covers the 2013-2016 production run, the pre-facelift FR-S and BRZ. Post-2016 applications should reference the appropriate Legamax cat-back options. The axle-back format is only available for this early production window.

The FT Breakdown

The Legamax axle-back is the first exhaust step for early FR-S and BRZ owners who want the sound improvement without the full cat-back commitment. It installs in an afternoon with basic hand tools and the Legamax muffler character is immediately noticeable. A good starting point for the exhaust build. The 87–88 dB(A) and 5.2 kg weight saving from the Legamax axle-back is the entry-level HKS exhaust upgrade for the early FR-S and BRZ — it provides a real quality improvement over the factory muffler at a lower price point than a full cat-back and with a simpler installation. For owners who want to start somewhere on the exhaust build without committing to the full system, this is the correct starting point.