From the basic shape of that muffler, it's not going to fit very well on an SVT.
1) The dual pipes will be too wide for the bumper cutouts
2) The muffler will have to be hung much lower than normal SVT mufflers
As mentioned, you wont gain 10HP from a pair of those mufflers. The SVT mufflers
aren't all that bad. (The resonator is a restriction...)