You could check the hose that goes from the turbo outlet to the charge air cooler for leaks. Are you sure the waste gate actuator arm is adjusted correctly? I know the turbo from Turbo Parts Canada was (at one time ) setup for the older turbos (2011-2012) so if you had a newer model (like my 2015) you had to move your actuator mechanism over to the new turbo. The older ones were actuated with pressure and the newer ones used vacuum. So more info might help, like what year your Evoque is and what turbo you replaced it with (OEM, vs aftermarket, etc).