i found this on Power Brokerz website the seller of Toomey pipe this made me not want to buy one go to there site to read the rest its pretty interesting(This is also where the "Boost Bottle" argument comes in....
Yes, there must be the cross-over tube, but the engine couldn't care less how big it is.... this tube is used to communicate the volume information from side to side, not to magically "store-and-forward" mixture for later use, as some have alleged. Nor is it able (as far as we can detect) to allow mixture to be drawn from both carbs at once..... So the "Boost Bottle" as a performance product is a complete placebo and only serves the manufacturer's pocket, not the customer's needs. Beware of companies who sell this kind of thing, they are not being true.
Remember, if it sounds too good to be true, it probably is....)