Akrapovic Yamaha R6 08-26 Track Day Link Pipe/Collector (SS)Optional stainless steel link pipe with resonator for mounting with the muffler and header set from the Evolution Line S Y6E9 APT or Racing Line S Y6R9 APT. It lowers the noise levels for use on racetracks where lower noise levels are required. This optional Track Day Link Pipe comes with an additional noise insert. Static noise level with Evolution Racing noise insert: 96,6 dB at 5500 rpm Static noise level with Track Day Link Pipe noise insert: 99,4