I just bought a 99 A4 with a couple mods. it has a movak exhaust on it and from what i can tell it's only the muffler portion. the car doesn't sound any different than stock. two questions (1) does this give me any more power? and if it doesn't do i have to install the rest of the system to get the power and sound?

 

If should give you some power if the piping is larger than stock and more free flowing than stock. But a 2.5"-3" from the turbo back would give you the sound and power.