2014 vs 2017 plus shelby

I have a 2014 SVT with a 6.2l. Thinking about Shelby Vegas upgrade on it. Has anyone here done it? Is it worth it? Should I be concerned about a 6 cyl in the 2017. My current raptor near perfect far as I'm concerned but not enough accel off the line. May do the Shelby thing and get new one but looking for input. Thanks

Save some money and just buy a whipple/roush blower and find a good shop/tuner.

I have no experience with them, just from the outside it seems like one hell of a markup for the Shelby name.