There has yet to be any proof substantiated by dynamometer reports that support any claim that removing the turbocharger silencer ring yields any quantifiable gains in engine or turbocharger performance. This modification will not increase peak boost, reduce turbo lag, or have any effect on exhaust gas temperature (EGT). This modification is to be carried out strictly in the pursuit of audible pleasure, and if you enjoy the sound of your Cummins turbodiesel than you'll likely be pleased with the results.
The silencer ring is secured in place at the mouth (inlet) of the turbocharger compressor housing by means of a large diameter retaining ring. Once the retaining ring is removed, the silencer simply lifts off the face of the compressor inlet as outlined in the following figures: