Yasekwa ekuqaleni koo-1980, ngumvelisi oqeqeshiweyo weemufflers zesithuthuthu.Kukho abasebenzi abangaphezu kwama-800, abagubungela indawo engaphezulu kweehektare ezingama-200, kunye nempahla esisigxina ye-300 yezigidi zeeyuan ezifana neendibano zocweyo kunye nezixhobo ezahlukeneyo zoomatshini.Umthamo wonyaka wemveliso yeemveliso ze-muffler ufikelela kwi-3.5 yezigidi zeengcezu, ezibalelwa kwi-30% yemarike ye-OEM yesithuthuthu yasekhaya, ibekwe kuqala e-China.Indawo yokuqala kwimveliso yeemveliso zesithuthuthu se-muffler.