Gunshots, explosions, and voice acting have been remastered for a more immersive surround-sound experience.
Some repacks lower the bitrate of cinematics or audio files, though "lossless" repacks keep the quality identical to the original. call of duty modern warfare 2 remastered highly compressed
However, if you have high-speed internet, downloading the official version from a digital storefront (like Battle.net) is always the safer and faster route, as it avoids the lengthy unpacking process. Gunshots, explosions, and voice acting have been remastered