Vibration

Hey Guys,
 
I just bought a 2008 A4 S-Line w/ Titanium package. I got it last Monday so its brand new. by the end of last week i installed the Carbonio intake and APR program. I also lowered it on H&Rs' and installed wheel spacers. I looks sick !!!! But, I am getting vibration at around 50 mph. I thought it was alignment and camber since I messed with the suspension but I took it to get the camber and alignment fixed and it did not fix the vibration problem. ???? DOes anyone know what this could be ?? I would really appreciate your help before i take it to the shop that did the upgrades and kill the guy ???
 
Thanks

If you feel the vibration only at certain speed, then most likely it's wheel balance. Take your car in and get the wheels balanced