The turbo resonator is a common culprit for untraceable boost leaks. The pipe either blows off or the orange seals rip. Alot of people opt for the replacing the orange seals, but this just prolongs the inevitable.
A silicon hose replacement ensures the fact the pipe will never have to be replaced again, unless of course it is somehow damaged.
Link for the silicon hose:
PLEASE NOTE IT COMES IN 3 COLOURS: RED, BLUE AND BLACK. A SPECIFIC COLOUR MIGHT NOT BE AVAILABLE DUE TO STOCK.
[ Ссылка ]
