I am new to this forum and have a USAM41A3 Heng long snow leopard with metal gearbox am looking to upgrade the speaker and smoke unit as you guys suggest but have no idea what is compatible with my tank I am in the UK and eBay links for said parts would be most welcomed fitting the parts is not a problem as such but obtaining the correct parts I struggle with also wish to change tracks wheels etc to metal ones but again don't know which parts are compatible appreciate you guys helping advising me please be patient with me as I learn to navigate this forum Thank you all
