Hennessey is currently selling a VelociRaptor "600" kit for Gen 2 Raptors. It used to include upgraded turbos. After having some engine troubles as a result of the turbo upgrades, Hennessey quietly hired a real shop to fix the trucks they ruined and then removed the upgraded turbos from the kit but left the power ratings and performance figures the same. Along with the price.
The guy is a fraud and his faulty work has burned a lot of Raptors to the ground, both here and abroad.
Caveat emptor, friends.