Ko te muffler wē motuhake he rite ki te whakaiti i te haruru waku na te hau me te wai i roto i te wai, me te hanga i te tohu korehau kia teitei ake, kia pai ake hoki, anti-corrosion, kore poke, iti haruru, ngawari te neke, ka taea te whakakii i te reera whakatikatika korehau. kia rite ki nga whakaritenga a te kiritaki, he tino watea te whakahaere.