Here i share you some since i doing this before till now

Code: 
http://rapidshare.com/files/250402178/40plusrar3.zip
Code: 
http://rapidshare.com/files/250363699/rarlinux-3.8.0.tar.gz
1. Download both... extract and add the 40plusrar3 (rapidleech) copy to ftp server
2. extract and copy to ftp server at rapidleech folder called RAR
3. chmod all RAR folder and all inside to 777
4. Have fun

http://i41.tinypic.com/98u1z7.jpg

Important : when u doing rar to part1 , part 2, else compresion level use "store" dont compress normal or other .. coz it made your server cry..