[cuntarrr]

So when I accelerate my engine makes this really high whistling noise, its hard to hear if your not paying attention, but if you know what your car is suppose to sound like then you can tell. it happens in between 1-3 gears. I just took my bumper off today to fix my fog lights but I don't think that could have done anything. Help please!

 

[DavesSpectra]

There is "plumbing" for the air intake that sits behind the left (drivers) side bumper cover. It's a box that has a snorkel that comes up next to the battery by the radiator.
If by chance you changed that or disturbed the plumbing this "could" create noise from air being sucked in through the change...
Just a thought...
Dave