if your after all out performance to better than stock my list would be staring with Predators, then B1MC, B1 originals, 440-1 SR M.W. ports,Eddy M.W. Victors, B1-BS stock unported, SR 440 port size, Eddy Victor 440 port size, Eddy RPM, 440 source then Pro Form. I don't know anything about the sidewinders heads from personel use or hearing anyone on this forum using them yet,except some dyno testing so far, so I won't be able to list them where they should be in my choice list ITHS