Yea i believe if you just disconnect that vaccume line going to the dapshot (little saucer with a rod comming out the bottom,) they will remain open, look at it, start your car and look at it again the rod should be sucked up into the dapshot i believe.. so just dissconnect it.
How ever, ware as this will be benefical at the top end of the power band, i believe it will have a negative effect at the lower to mid range.