On the coyote motors I would not boost more than 10 to 12psi stock internals. Personaly I like the TVS for the coyote motors mine is a roush 2300 TVS only at 7psi boost at 55o rwhp. On my set up to hit 600 all I would need is cat deletes and a 82mm pulley and re tune would gain me 600+. If I...