garyq,
it look likes singaw or magaspang na tunog coming from the turbo.
parang galing dun sa naka attached from exhaust manifold to the
turbo and intercooler assembly.na checked ko din yung exhaust
gasket papunta ng tambutso ok naman walang singaw from there.
singaw ba is leakage? if galing sa exhaust there should be blackening of the singaw part, like sa tip ng tambutso ang color. try to look if meron ganyan so that you will know if may singaw. sa exhaust side lang ha, sa intake medyo mahirap, sometimes if sa intake ang singaw may parang moisture like oil leakage ang itsura.
na checked ko yesterday, i'd noticed oil moisture sa may intake esp. dun sa rubber hose.ano po ba magandang gawin to fix that.is it the source of singaw or engine noise?