LT1-7

It was all running great when I brought it to the drags and go some better times. Then a couple days later, boost wouldn't go pass 10psi but were loud as hell. Turns out I had a gasket leak at my Apex BOV. Fixed it and now I can boost to 12 but then makes a weird air pump sound then drops to 10psi and then down to 8psi. When it makes the aip pump sound, it kindda sounds like the turbos are being overworked. Do you think when I had the gasket leak, the turbos spun out too much since the wastgate probably never opened up? Does my turbos sound rebuildable?