After owning both a 3.6KB and the Gen3 TVS I felt the KB was a little lazy down low but was a monster on the topend, but that was with a stock 5.8 at about 20psi so I'm sure that played a big factor. The 2.65 TVS feels great down low and pulls hard all the way to 6,500 at 18 to 19psi. I've felt that the 2.65 was just a better supercharger for a stock 5.4/5.8. Again just my opinion. A 3.2 KB or a Gen5 3.0 whipple is great choice also. For a built engine idk maybe a 4.2 KB is the way to go. I know Lund Sr's 14 GT500 makes almost 1300whp with a 2.65, maybe it would make more with a whipple or KB.