2007 GT modifications

[RAGDADDY]

I bought a new '07 GT in last June.  Right away, I added a few things- Boss Custom 20" rims w/ lo-pros on them. SLP Loudmouth axle back exhaust/a Max Energy Programmer by Hypertech/and a matching Grabber Orange Cold Air Intake by JLT Performance.  It was decent before, with the add-ons, it is a bit better.  I plan to put some pulleys on it in the spring.  What else can I put on it besides an off road pipe, or throttle body for performance?

[Bossnutt]

Granted I know absolutely nothing about the newer models, but can you add a high performance chip to it?

[RAGDADDY]

I ALREADY USED THE  HYPERTECH MAX ENERGY PROGRAMMER TO UP THE RPMS, ADJUST THE COMPUTER FOR THE COLD AIR INTAKE, ADJUST SPEEDO FOR TIRE/RIM SIZE.  I'D LIKE TO PUT AN H/OR X PIPE ON IT BUT.  ONE OF THE GUYS AT MY GYM TOLD ME THAT CHANGING TO AN OFF-ROAD PIPE WILL MAKE THE CAR SOUND OBNOXIOUS AS HECK!  I'D LIKE TO DO MORE BUT, DON'T WANT TO VOID THE WARRANTY.

THANKS FOR YOUR INPUT, BROTHER. 

[Thierry]

 There is all kind of performance parts available and if you get them installed by a Ford dealership, you can still have your Mustang under warranty. Ford Racing is the best source for performance parts that will not void the warranty and they have a huge list of options depending of your budget. I personally don't find anything wrong with the sound of a V8 with racing exhaust but the choice is up to you not your gym teacher 
By the way, Bossnutt is a sister and not a brother