Yoshi makes the perfect pipe for the drz400. As quiet as stock, but lighter, better sound, cool factor and quality. They add everything you need, including spring puller and plug.
The RS-2 is a really versatile and very potent pipe. It is basically an evolution of Yoshimura's original TRC design but with a slightly different (pyramidal) shape that features increased volume. The volume enables a quieter system and larger core, which in turn increases power and power delivery.
Pro-Series mufflers are available in either titanium or carbon canisters and come with the 99db non-spark arrested insert. Optional inserts available are the Yoshimura 96dB U.S.F.S. spark arrested insert, the Yoshimura 94dB motocross non-spark arrested, or an off-road spark arrested insert.