The stock exhaust is a really good setup, fine tuned for the SVTF. Just get the ORP, if you like and can afford to then get a aftermarket exhaust setup of your choice. But the ORP is a great mod to have with decent gains to offer as well.
Dynomite Comes In Small Packages.
"Why ask, when the answer you hear is not what you wish to hear, nor the answer you were seeking?"