4 chamber EFRA homologated pipe for .12 enginesThe only able to effectively going down to the 90 dB level.
After extensive testing here you are the first effective solution to the tracks in trouble for excessive noise, and without sacrificing performance.
A new pipe specially designed to reduce the engine noise, the reduction insured is equal to 6 dB and adding the INS box Efra the noise goes down further without loss of performance.