$375 is crazy! I would rather fab one myself and get what i want.
Don, I would like to gain more top end h.p...as everyone knows these flatheads have plenty of torque but are short on h.p. This may be the best of both worlds, torque off the line and a gain in h.p as the speed increases. I don't think i will get better gas milage, with the dual b& b's i think i would get worse gas milage because an increase in air means there needs to be an increase in gas. I know when i ran mine with a single b&b and hooked up the air intake i got a noticeable increase in h.p. after 40mph. I hope the same happens now but with more top end h.p.