Brettspeed cast manifold with G30-660 - info thread
#301
To me it looks like a huge mechanical linkage throttle body with possibly two butterfly valves. Looks like the intake tubing tapers into a larger size going to the TB, than tapers down in size leaving the TB and into the upper manifold, hard to tell with that low resolution picture though. I could see two butterfly valves being better at equalizing the flow between both rotors, but I am no expert that is for sure.
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