The 70RR is a competition muffler that maximizes the potential of the VTEC engine. Back pressure has been reduced to the limit by expanding the main pipe diameter to 70φ, which is the maximum of the J’S RACING muffler, and replacing it from the front part of the catalyst (excluding some vehicle models). By reducing the weight of the muffler, the potential of the entire car is also improved.

The 70RS is a competition muffler that maximizes power and takes into account circuit volume restrictions. A silencer is attached to the center pipe while the main pipe diameter is 70φ in order to bring out the power. By replacing after the catalyst, the noise reduction effect is improved compared to the RR series. This is a competition muffler that combines power and muffling effect.

The 60RS developed for the street has a main pipe of 60φ and the silencer part has a straight structure to achieve torque and power up in all areas. The dry VTEC sound peculiar to full titanium sounds comfortably, and it meets the safety standard by using the inner silencer sold separately.