sauvegarder en mp3 a la place du wav

mon application permet de faire des enregistrement audio, mais en wav
et le wav prend beaucoup de taille,
et j'aimerai savoir si on peux le faire avec mp3,
voici ma class qui met l'enregistremen en wav :
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 public class WavManager
    {
        public static void SavePcmToWav(Stream rawData, Stream output, AudioFormat audioFormat)
        {
            if (audioFormat.WaveFormat !=  WaveFormatType.Pcm)
                throw new ArgumentException("Only PCM coding is supported.");
 
            BinaryWriter bwOutput = new BinaryWriter(output);
 
            // Write down the WAV header.
            // Refer to http://technology.niagarac.on.ca/courses/ctec1631/WavFileFormat.html
            // for details on the format.
 
            // Note that we use ToCharArray() when writing fixed strings
            // to force using the char[] overload because
            // Write(string) writes the string prefixed by its length.
 
            // -- RIFF chunk
 
            bwOutput.Write("RIFF".ToCharArray());
 
            // Total Length Of Package To Follow
            // Computed as data length plus the header length without the data
            // we have written so far and this data (44 - 4 ("RIFF") - 4 (this data))
            bwOutput.Write((uint)(rawData.Length + 36));
 
            bwOutput.Write("WAVE".ToCharArray());
 
            // -- FORMAT chunk
 
            bwOutput.Write("fmt ".ToCharArray());
 
            // Length Of FORMAT Chunk (Binary, always 0x10)
            bwOutput.Write((uint)0x10);
 
            // Always 0x01
            bwOutput.Write((ushort)0x01);
 
            // Channel Numbers (Always 0x01=Mono, 0x02=Stereo)
            bwOutput.Write((ushort)audioFormat.Channels);
 
            // Sample Rate (Binary, in Hz)
            bwOutput.Write((uint)audioFormat.SamplesPerSecond);
 
            // Bytes Per Second
            bwOutput.Write((uint)(audioFormat.BitsPerSample * audioFormat.SamplesPerSecond * audioFormat.Channels / 8));
 
            // Bytes Per Sample: 1=8 bit Mono, 2=8 bit Stereo or 16 bit Mono, 4=16 bit Stereo
            bwOutput.Write((ushort)(audioFormat.BitsPerSample * audioFormat.Channels / 8));
 
            // Bits Per Sample
            bwOutput.Write((ushort)audioFormat.BitsPerSample);
 
            // -- DATA chunk
 
            bwOutput.Write("data".ToCharArray());
 
            // Length Of Data To Follow
            bwOutput.Write((uint)rawData.Length);
 
            // Raw PCM data follows...
 
            // Reset position in rawData and remember its origin position
            // to restore at the end.
            long originalRawDataStreamPosition = rawData.Position;
            rawData.Seek(0, SeekOrigin.Begin);
 
            // Append all data from rawData stream into output stream.
            byte[] buffer = new byte[4096];
            int read;       // number of bytes read in one iteration
            while ((read = rawData.Read(buffer, 0, 4096)) > 0)
            {
                bwOutput.Write(buffer, 0, read);
            }
 
            rawData.Seek(originalRawDataStreamPosition, SeekOrigin.Begin);
        }
    }
merci d'avance