Intake got me higher times

I have a 2001 V6 mustang. Only things I have done to it so far is I put on true dual 2.5" cat-back Magnaflow exhaust. I has running in the very low 16s. I then put on a MAC CAI. I feel alot more torque and high end power, but then I went to the track and ran consistently high 16s. WHAT HAPPENED?? I should have broken into 15s. Any input would be VERY HELPFUL!!!