chinese copy hai aur after abt 2/3 months is ki jalian kharak jati hai....sound bhe faig ho jaye ge aur top end per muffler ki sound ki bajaye jalian kharaknay ki awaz aye ge
LOLz! This is is all I could think of after reading some of the replies here.
i,am using boofer 123 silencer in my spectra. more than 1 year has pass that silencer is working good.