2011 Shelby didn't come with a TVS, it came with a Eaton M122.
( TVS was the 13/14 MY )
Either blower will fit, but you can't use the 5.4 / 5.8 manifold on your motor. Roush sells a 2300 kit, not sure if you can buy just the manifold. A friend put one on his 13 GT, a 625 kit.
" Chance favors the prepared mind "
2011 - lightly modded to 776rwhp &
2014 - detuned to 780rwhp
6400 for a tuner kit. Just buy a complete kit from vmp. I just got a STAGE 2 kit complete for 6300 and change. And they have that badass whine most people want and make better power from what I've seen