Spec II's expansion chambers were first conceived in 1974. Through the years, they have done duty on Championship-winning RDs and street-going Cafe RDs. All the while, they have been benefiting from a steady program of refinement.

Ground clearance is an important consideration at Spec II. Our expansion chambers are not inline stampings. This allows us to offer the most ground clearance for the achievement of high cornering speeds. On some models of the RD series, Spec II makes two models of chambers. One model will clear the stock footpegs and the other model is for RDs equipped with rearsets.

Aluminum silencers are not all the same. Spec II's silencers are a snap to maintain. They feature an internal snap ring for baffle removal. The all bolt construction offers easy replacement in case of damage. Finally, our pipes produce a restrained yet exciting sound.

Our RZ350 street pipes bring about a 16 lb. weight loss, a wide powerband from 6,500 RPM to 10,500 RPM and an over 20% power increase - which all result in a truly awesome motorcycle -, whereas our hand-built race RZ350 chambers feature full power to 11,500 RPM with a super wide powerband. Order today!

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Spec II