Akrapovic Racing Line Full Exhaust System Stainless Steel – Kawasaki ZX-4RR (2023–2026) S-K2R3-APC

The Akrapovic Racing Line full exhaust system for the Kawasaki ZX-4RR (2023–2026) is an engineering-led upgrade that delivers measurable, back-to-back gains straight from the crate. Shedding 5.2 kg over the stock system and unlocking an additional 2.2 hp and 2.2 Nm of torque, this stainless steel full system is the most complete performance exhaust solution available for the ZX-4RR platform.

Key Features

• Significant weight reduction of 5.2 kg — stock system weighs 9.6 kg; this system weighs just 4.4 kg
• Power gain of 2.2 hp, taking peak output from 71.4 hp to 73.6 hp at 14,600 RPM
• Torque improvement of 2.2 Nm at 7,000 RPM for stronger mid-range delivery
• Race-grade sound: 107.5 dB at 7,250 RPM without DB-killer (+12.9 dB over stock)
• DB-killer included for added versatility at noise-sensitive venues
• Stainless steel headers with lambda sensor connection for ECU compatibility
• Titanium slip-on silencer shell with carbon end cap — all internal metallic components also in titanium

Build Quality & Materials

Akrapovic have constructed the Racing Line around stainless steel headers that retain the lambda sensor port, ensuring the stock fuelling management system remains functional without additional mapping hardware on the day of fitment. The slip-on silencer takes the lightweight approach further: the outer shell, brackets and all internal metallic parts are titanium, while the end cap is finished in carbon fibre. This combination keeps the system at 4.4 kg total — a substantial saving that translates directly into improved power-to-weight and sharper steering response under braking and acceleration.

Performance on Track

The numbers speak plainly. Tested back to back against the standard Kawasaki system, the Racing Line delivers 73.6 hp at 14,600 RPM and an additional 2.2 Nm of torque at 7,000 RPM — gains that broaden the usable power band through the mid-range and extend the top-end rush the ZX-4RR inline-four is known for. The exhaust note rises to 107.5 dB at 7,250 RPM when the DB-killer is removed, giving the bike an unmistakable race presence in the paddock and on circuit. When regulations require a quieter note, the included DB-killer drops the output back to compliant levels without permanent modification.

Everyday Usability & Value

While the Racing Line is homologated for track and competition use only and carries no road-type approval, its real-world value is clear for any ZX-4RR owner serious about performance. The lambda sensor connection means no major wiring work on initial fitment, the DB-killer gives flexibility across different circuit noise bylaws, and the one-piece stainless-to-titanium architecture removes the maintenance headaches associated with multi-material joins. For riders who want a single, complete system that handles headers and silencer in one purchase — and delivers documented dyno results — the Racing Line represents straightforward, measurable value. Part number S-K2R3-APC.

Fitment & Compatibility

This exhaust system is designed exclusively for the following motorcycle:

• Kawasaki ZX-4RR — model years 2023, 2024, 2025, 2026

Specifications