shit stan, i dunno. they come in 2", 2.5", 3", and 4" models. i think Kings start at like $600 for a bottom of the line coil-carrier. so depending on bore and stroke they go up. then you get into the bypasses which vary in even more ways.
bottom line they are fucking expensive. id bet the guy had a cool 10g's in shocks and springs. then you gotta get em valved right.
and the guys job is to mow lawns, i dont understand.