SC Project 4-2-1 Stainless Steel Headers for Kawasaki Z900 (2017-24)
The SC Project 4-2-1 Stainless Steel Headers for Kawasaki Z900 (2017-24) focus on performance and lightness. These 4-2-1 headers use SAE 304 stainless steel construction. The system also houses the original lambda sensor. It delivers a claimed gain of +8.8 hp at 10200 rpm and +7.1 Nm at 8200 rpm. It also saves 4.3 kg compared with the OEM system. Visit our website for more parts and accessories of Kawasaki
4-2-1 Header Design
SC-Project developed this full system through its in-house R&D department. The development also involved major MotoGP and SBK championship teams. SC-Project offers the system in full titanium or AISI 304 stainless steel versions.
This product uses SAE 304 stainless steel headers. The 4-2-1 configuration forms part of the complete SC-Project groupset for the Kawasaki Z900. It also works with the entire range of slip-on mufflers dedicated to the motorcycle for which the system was designed.
Performance and Weight Reduction
The headers produce a claimed +8.8 hp at 10200 rpm. They also deliver +7.1 Nm at 8200 rpm. Alongside these figures, the system reduces overall weight.
The SC system weighs 4 kg. The OEM system weighs 8.3 kg. Therefore, the headers provide a total weight saving of 4.3 kg.
Original Lambda Sensor
The SC-Project full system houses the original lambda sensor. The technical specifications also confirm the inclusion of a lambda probe.
In addition, the system removes the original catalytic converter. According to the supplied information, this allows an important reduction in operating temperature. It also gives the Z900 a deep and gloomy sound.
SAE 304 Stainless Steel Construction
The headers use SAE 304 stainless steel. SC-Project also offers the complete system in a full titanium version. This product, however, uses the stainless steel header configuration.
The complete groupset comes from SC-Project’s research and development work. The company developed it alongside major MotoGP and SBK championship teams.
Racing Use and ECU Tuning
SC-Project specifies these headers for racing use only. For better performance, the company recommends an additional control unit or remapping of the standard unit.
The technical specifications list the system as 4-2-1 Headers. They also confirm bracket mounting and support for a lambda probe.


















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