Hi,
when doing break in, it's important not to run the engine through high revs on every gear! Till 3000 revs it's agood range but make sure not to exceed it! If it's yb, it's important to keep the boost as low as possible.
As for myself when doing break in with a cossie, i remove completely the dump valve and fit a common filter. With this, no boost will enter the engine and so, the boost will flow out the hose pipe(throttle to intercooler).
The rule of thumb during break in, is to cruise the engine through every gear in a low rev range.
Hope i helped you out