Four simple things to think about:

1) If the A/C is on, shut it OFF!!!

2) The secondaries kick in at 3,500 and the car will hesitate.

3) I have 53K miles, 0 problems and the exhaust tips are clean as a whistle.

4) What is your City vs. Highway driving ratio?

99 SVT Black/Tan #1090/2760
82K Miles.......B&M Edge Shifter
Mobil1 5-30.....Side Markers
Ford Synth MTX # XT-M5-QS
Locking Lugs....Cup Holders
Black Sail Panels...TH Fix
Aluminum Gas Filler Door
BS Potenza S-03's
KVR Cross Drilled Rotors + Pads
Dual Mode Damper - soon
Clarion head unit
Pioneer 2-ways