EDIT: A little TUT for you ....
1. Open your injector and put the "Use CE or MHS bypass.dll" bypass , then press auto-inject to Engine.exe
2. Open combat Arms (.dll should be injected now)
3. Open Cheetah engine ( i don't know if we have to run as admin in vista)
4. Click at process then choose Engine.exe
5. Then tick "Enable speedhack"
6. Set the speedhack at 1.25 ( if u up more it will get detected)
7. Play 3 FULL games then set the speed to like ~1.50
Thank me if i helped