[930turbo]

I don't think there would be any advantage to isolated runner or ITB intake design with a turbocharger. In order to keep the boost up between gear shifts and reduce the risk of compressor damage, you need a source of vacuum to assist in opening a pop-off valve(recirculating in the case of CIS) . The only way to accomplish this is to access individual sources from each isolated runner down-stream of the throttle bodies and tie them together before the valve. Your efforts would probably be better spent in another area of the engine build. The common plenum design is tried, true and effective. The idea of a reserve boost accumulator probabaly wouldn't work due to the consumption exceeding the reserve upon initial throttle deflection. The volume necessary to be effective would be so large it would take a noticable amount of time to recharge the tank. I believ all it would do is delay the lag to immediately following the surge from your reserve boost - followed by tank repressurization lag. Just a thought.